Good morning all,

I just bought a Dell Latitude 5440 as it has two RAM slots. One is
populated by a DDR4 16GB sodimm.
But I have a spare sodimm of this spec:

https://www.amazon.co.uk/SK-Hynix-2666MHz-HMA81GS6JJR8N-VK-Sodimm/dp/B07TN25C63

SK Hynix 8GB 2666MHz HMA81GS6JJR8N-VK Sodimm Memory Module

HMA81GS6JJR8N-VK - SK Hynix 1x 8GB DDR4-2666 SODIMM PC4-21300V-S
Single Rank x8 Module

Description

HMA81GS6JJR8NVK
MEMORY MODULE
SINGLE RANK
8 GB
UNBUFFERED
CL19
260-PIN
SODIMM
1.2 V

Will this fit and work in my new laptop?

On 24/04/2024 08:59, Dan wrote:
> Good morning all,
>
> I just bought a Dell Latitude 5440 as it has two RAM slots. One is
> populated by a DDR4 16GB sodimm.
> But I have a spare sodimm of this spec:
>
> https://www.amazon.co.uk/SK-Hynix-2666MHz-HMA81GS6JJR8N-VK-Sodimm/dp/B07TN25C63
>
> SK Hynix 8GB 2666MHz HMA81GS6JJR8N-VK Sodimm Memory Module
>
>
>
> HMA81GS6JJR8N-VK - SK Hynix 1x 8GB DDR4-2666 SODIMM PC4-21300V-S
> Single Rank x8 Module
>
>
> Description
>
> HMA81GS6JJR8NVK
> MEMORY MODULE
> SINGLE RANK
> 8 GB
> UNBUFFERED
> CL19
> 260-PIN
> SODIMM
> 1.2 V
>
>
> Will this fit and work in my new laptop?

is that the Latitude e5440 ?

>>
>> Will this fit and work in my new laptop?
>
>
> is that the Latitude e5440 ?
>

if it is, then the max memory for the machine is 16 GB according to Mr
Memory ...

https://www.mrmemory.co.uk/memory-ram-upgrades/dell/latitude/e5440

On Wed, 24 Apr 2024 09:20:40 +0100, Abandoned Trolley
<fred@fred-smith.co.uk> wrote:

>
>>>
>>> Will this fit and work in my new laptop?
>>
>>
>> is that the Latitude e5440 ?
>>
>
>
>if it is, then the max memory for the machine is 16 GB according to Mr
>Memory ...
>
>https://www.mrmemory.co.uk/memory-ram-upgrades/dell/latitude/e5440

No, it is a Latitude 13th gen 5440. According to Crucial UK, it can
take up to 64GB RAM either DDR4 or DDR5.

>
> No, it is a Latitude 13th gen 5440. According to Crucial UK, it can
> take up to 64GB RAM either DDR4 or DDR5.
>

Why are you wasting time with a 8GB stick then ?

Abandoned Trolley wrote:

> Dan wrote:
>
>> it is a Latitude 13th gen 5440. According to Crucial UK, it can
>> take up to 64GB RAM either DDR4 or DDR5.
>
> Why are you wasting time with a 8GB stick then ?

Because he has it going spare ...

On 4/24/2024 3:59 AM, Dan wrote:
> Good morning all,
>
> I just bought a Dell Latitude 5440 as it has two RAM slots. One is
> populated by a DDR4 16GB sodimm.
> But I have a spare sodimm of this spec:
>
> https://www.amazon.co.uk/SK-Hynix-2666MHz-HMA81GS6JJR8N-VK-Sodimm/dp/B07TN25C63
>
> SK Hynix 8GB 2666MHz HMA81GS6JJR8N-VK Sodimm Memory Module
>
>
>
> HMA81GS6JJR8N-VK - SK Hynix 1x 8GB DDR4-2666 SODIMM PC4-21300V-S
> Single Rank x8 Module
>
>
> Description
>
> HMA81GS6JJR8NVK
> MEMORY MODULE
> SINGLE RANK
> 8 GB
> UNBUFFERED
> CL19
> 260-PIN
> SODIMM
> 1.2 V
>
>
> Will this fit and work in my new laptop?
>

It's not this machine, because the processor here takes DDR3 memory.

Dell Latitude E5440, Intel Core i5-4300U
(Fourth gen Haswell, DDR3, so not your machine)

This might be your machine.

https://www.dell.com/en-ca/shop/laptops-ultrabooks/latitude-5440-laptop/spd/latitude-14-5440-laptop

The Dell URL teases us with tasty processor. We write it down.

13th Gen Intel Core i5-1335U
(12 MB cache, 10 cores, 12 threads, up to 4.6 GHz Turbo) 2 performance cores 8 efficiency cores

A check on ARC gets us a reference:

https://ark.intel.com/content/www/us/en/ark/products/232153/intel-core-i5-1335u-processor-12m-cache-up-to-4-60-ghz.html

Memory Specifications

Max Memory Size (dependent on memory type) 96 GB <=== DDR5 (not your machine) limit
Memory Types Up to DDR5 5200 MT/s ( DDR4 Limit would be 64GB or 2x32GB SODIMM )
Up to DDR4 3200 MT/s
Up to LPDDR5/x 6400 MT/s
Up to LPDDR4x 4267 MT/s
Max # of Memory Channels 2
ECC Memory Supported: No ("we is Intel, we don't do ECC")

When the DDR5 offering is a weird number, you select the
nearest power-of-two below that to develop your own DDR4 limitation value.

It's Intel Flex Memory, so combinations will work. Or matched sets will work.

Plug and play.

Test with Memtest.

Please ignore the excessive and stupid advertising on this page.

https://www.memtest.org/

Look to the right hand side bar, for choices.

Windows USB Installer (32/64 bits) <=== direct to USB key

Linux ISO (32 bits) <=== make a CD or Rufus to a USB key

Linux ISO (64 bits) <=== make a CD or Rufus to a USB key

Linux ISO w/ GRUB (64 bits)

Binary Files (.bin/.efi)

Source code (.tar.gz)
Used to build these binaries

The executable code for that, is normally small.
It used to fit on a floppy :-) On a floppy without
a file system (direct boot into binary).

Test before adding your new DIMM.

Test after adding your new DIMM.

Compare the bandwidth numbers in the upper left of the screen.

*******

You can also get some info about the existing DIMM inside

https://www.cpuid.com/softwares/cpu-z.html

ZIP English

With the cpuid.ini next to the cpuid.exe , you can
run it and it has an interface to report RAM details
(for your one stick). One of the panels has a "Save"
option and the text file can be mined for materials
to copy and paste.

Paul

On Wed, 24 Apr 2024 06:19:21 -0400, Paul <nospam@needed.invalid>
wrote:

>On 4/24/2024 3:59 AM, Dan wrote:
>> Good morning all,
>>
>> I just bought a Dell Latitude 5440 as it has two RAM slots. One is
>> populated by a DDR4 16GB sodimm.
>> But I have a spare sodimm of this spec:
>>
>> https://www.amazon.co.uk/SK-Hynix-2666MHz-HMA81GS6JJR8N-VK-Sodimm/dp/B07TN25C63
>>
>> SK Hynix 8GB 2666MHz HMA81GS6JJR8N-VK Sodimm Memory Module
>>
>>
>>
>> HMA81GS6JJR8N-VK - SK Hynix 1x 8GB DDR4-2666 SODIMM PC4-21300V-S
>> Single Rank x8 Module
>>
>>
>> Description
>>
>> HMA81GS6JJR8NVK
>> MEMORY MODULE
>> SINGLE RANK
>> 8 GB
>> UNBUFFERED
>> CL19
>> 260-PIN
>> SODIMM
>> 1.2 V
>>
>>
>> Will this fit and work in my new laptop?
>>
>
>It's not this machine, because the processor here takes DDR3 memory.
>
> Dell Latitude E5440, Intel Core i5-4300U
> (Fourth gen Haswell, DDR3, so not your machine)
>
>This might be your machine.
>
>https://www.dell.com/en-ca/shop/laptops-ultrabooks/latitude-5440-laptop/spd/latitude-14-5440-laptop
>
>The Dell URL teases us with tasty processor. We write it down.
>
> 13th Gen Intel Core i5-1335U
> (12 MB cache, 10 cores, 12 threads, up to 4.6 GHz Turbo) 2 performance cores 8 efficiency cores
>
>A check on ARC gets us a reference:
>
>https://ark.intel.com/content/www/us/en/ark/products/232153/intel-core-i5-1335u-processor-12m-cache-up-to-4-60-ghz.html
>
>Memory Specifications
>
> Max Memory Size (dependent on memory type) 96 GB <=== DDR5 (not your machine) limit
> Memory Types Up to DDR5 5200 MT/s ( DDR4 Limit would be 64GB or 2x32GB SODIMM )
> Up to DDR4 3200 MT/s
> Up to LPDDR5/x 6400 MT/s
> Up to LPDDR4x 4267 MT/s
> Max # of Memory Channels 2
> ECC Memory Supported: No ("we is Intel, we don't do ECC")
>
>When the DDR5 offering is a weird number, you select the
>nearest power-of-two below that to develop your own DDR4 limitation value.
>
>It's Intel Flex Memory, so combinations will work. Or matched sets will work.
>
>Plug and play.
>
>Test with Memtest.
>
>Please ignore the excessive and stupid advertising on this page.
>
>https://www.memtest.org/
>
>Look to the right hand side bar, for choices.
>
> Windows USB Installer (32/64 bits) <=== direct to USB key
>
> Linux ISO (32 bits) <=== make a CD or Rufus to a USB key
>
> Linux ISO (64 bits) <=== make a CD or Rufus to a USB key
>
> Linux ISO w/ GRUB (64 bits)
>
> Binary Files (.bin/.efi)
>
> Source code (.tar.gz)
> Used to build these binaries
>
>The executable code for that, is normally small.
>It used to fit on a floppy :-) On a floppy without
>a file system (direct boot into binary).
>
>Test before adding your new DIMM.
>
>Test after adding your new DIMM.
>
>Compare the bandwidth numbers in the upper left of the screen.
>
>*******
>
>You can also get some info about the existing DIMM inside
>
>https://www.cpuid.com/softwares/cpu-z.html
>
> ZIP English
>
>With the cpuid.ini next to the cpuid.exe , you can
>run it and it has an interface to report RAM details
>(for your one stick). One of the panels has a "Save"
>option and the text file can be mined for materials
>to copy and paste.
>
> Paul

Thanks to all. I fitted it and its bios recognises the new module.
Now I have 24 GB RAM.

Dan wrote:
> On Wed, 24 Apr 2024 06:19:21 -0400, Paul <nospam@needed.invalid>
> wrote:
>
>> On 4/24/2024 3:59 AM, Dan wrote:
>>> Good morning all,
>>>
>>> I just bought a Dell Latitude 5440 as it has two RAM slots. One is
>>> populated by a DDR4 16GB sodimm.
>>> But I have a spare sodimm of this spec:
>>>
>>> https://www.amazon.co.uk/SK-Hynix-2666MHz-HMA81GS6JJR8N-VK-Sodimm/dp/B07TN25C63
>>>
>>> SK Hynix 8GB 2666MHz HMA81GS6JJR8N-VK Sodimm Memory Module
>>>
>>>
>>>
>>> HMA81GS6JJR8N-VK - SK Hynix 1x 8GB DDR4-2666 SODIMM PC4-21300V-S
>>> Single Rank x8 Module
>>>
>>>
>>> Description
>>>
>>> HMA81GS6JJR8NVK
>>> MEMORY MODULE
>>> SINGLE RANK
>>> 8 GB
>>> UNBUFFERED
>>> CL19
>>> 260-PIN
>>> SODIMM
>>> 1.2 V
>>>
>>>
>>> Will this fit and work in my new laptop?
>>>
>>
>> It's not this machine, because the processor here takes DDR3 memory.
>>
>> Dell Latitude E5440, Intel Core i5-4300U
>> (Fourth gen Haswell, DDR3, so not your machine)
>>
>> This might be your machine.
>>
>> https://www.dell.com/en-ca/shop/laptops-ultrabooks/latitude-5440-laptop/spd/latitude-14-5440-laptop
>>
>> The Dell URL teases us with tasty processor. We write it down.
>>
>> 13th Gen Intel Core i5-1335U
>> (12 MB cache, 10 cores, 12 threads, up to 4.6 GHz Turbo) 2 performance cores 8 efficiency cores
>>
>> A check on ARC gets us a reference:
>>
>> https://ark.intel.com/content/www/us/en/ark/products/232153/intel-core-i5-1335u-processor-12m-cache-up-to-4-60-ghz.html
>>
>> Memory Specifications
>>
>> Max Memory Size (dependent on memory type) 96 GB <=== DDR5 (not your machine) limit
>> Memory Types Up to DDR5 5200 MT/s ( DDR4 Limit would be 64GB or 2x32GB SODIMM )
>> Up to DDR4 3200 MT/s
>> Up to LPDDR5/x 6400 MT/s
>> Up to LPDDR4x 4267 MT/s
>> Max # of Memory Channels 2
>> ECC Memory Supported: No ("we is Intel, we don't do ECC")
>>
>> When the DDR5 offering is a weird number, you select the
>> nearest power-of-two below that to develop your own DDR4 limitation value.
>>
>> It's Intel Flex Memory, so combinations will work. Or matched sets will work.
>>
>> Plug and play.
>>
>> Test with Memtest.
>>
>> Please ignore the excessive and stupid advertising on this page.
>>
>> https://www.memtest.org/
>>
>> Look to the right hand side bar, for choices.
>>
>> Windows USB Installer (32/64 bits) <=== direct to USB key
>>
>> Linux ISO (32 bits) <=== make a CD or Rufus to a USB key
>>
>> Linux ISO (64 bits) <=== make a CD or Rufus to a USB key
>>
>> Linux ISO w/ GRUB (64 bits)
>>
>> Binary Files (.bin/.efi)
>>
>> Source code (.tar.gz)
>> Used to build these binaries
>>
>> The executable code for that, is normally small.
>> It used to fit on a floppy :-) On a floppy without
>> a file system (direct boot into binary).
>>
>> Test before adding your new DIMM.
>>
>> Test after adding your new DIMM.
>>
>> Compare the bandwidth numbers in the upper left of the screen.
>>
>> *******
>>
>> You can also get some info about the existing DIMM inside
>>
>> https://www.cpuid.com/softwares/cpu-z.html
>>
>> ZIP English
>>
>> With the cpuid.ini next to the cpuid.exe , you can
>> run it and it has an interface to report RAM details
>> (for your one stick). One of the panels has a "Save"
>> option and the text file can be mined for materials
>> to copy and paste.
>>
>> Paul
>
>
>
> Thanks to all. I fitted it and its bios recognises the new module.
> Now I have 24 GB RAM.

Do you notice any improvement in performance?
There might even be a degradation in performance, given the RAM
configuration you've adopted.

Ed

On Wed, 24 Apr 2024 18:35:01 +0100, Ed Cryer <ed@somewhere.in.the.uk>
wrote:

>Dan wrote:
>> On Wed, 24 Apr 2024 06:19:21 -0400, Paul <nospam@needed.invalid>
>> wrote:
>>
>>> On 4/24/2024 3:59 AM, Dan wrote:
>>>> Good morning all,
>>>>
>>>> I just bought a Dell Latitude 5440 as it has two RAM slots. One is
>>>> populated by a DDR4 16GB sodimm.
>>>> But I have a spare sodimm of this spec:
>>>>
>>>> https://www.amazon.co.uk/SK-Hynix-2666MHz-HMA81GS6JJR8N-VK-Sodimm/dp/B07TN25C63
>>>>
>>>> SK Hynix 8GB 2666MHz HMA81GS6JJR8N-VK Sodimm Memory Module
>>>>
>>>>
>>>>
>>>> HMA81GS6JJR8N-VK - SK Hynix 1x 8GB DDR4-2666 SODIMM PC4-21300V-S
>>>> Single Rank x8 Module
>>>>
>>>>
>>>> Description
>>>>
>>>> HMA81GS6JJR8NVK
>>>> MEMORY MODULE
>>>> SINGLE RANK
>>>> 8 GB
>>>> UNBUFFERED
>>>> CL19
>>>> 260-PIN
>>>> SODIMM
>>>> 1.2 V
>>>>
>>>>
>>>> Will this fit and work in my new laptop?
>>>>
>>>
>>> It's not this machine, because the processor here takes DDR3 memory.
>>>
>>> Dell Latitude E5440, Intel Core i5-4300U
>>> (Fourth gen Haswell, DDR3, so not your machine)
>>>
>>> This might be your machine.
>>>
>>> https://www.dell.com/en-ca/shop/laptops-ultrabooks/latitude-5440-laptop/spd/latitude-14-5440-laptop
>>>
>>> The Dell URL teases us with tasty processor. We write it down.
>>>
>>> 13th Gen Intel Core i5-1335U
>>> (12 MB cache, 10 cores, 12 threads, up to 4.6 GHz Turbo) 2 performance cores 8 efficiency cores
>>>
>>> A check on ARC gets us a reference:
>>>
>>> https://ark.intel.com/content/www/us/en/ark/products/232153/intel-core-i5-1335u-processor-12m-cache-up-to-4-60-ghz.html
>>>
>>> Memory Specifications
>>>
>>> Max Memory Size (dependent on memory type) 96 GB <=== DDR5 (not your machine) limit
>>> Memory Types Up to DDR5 5200 MT/s ( DDR4 Limit would be 64GB or 2x32GB SODIMM )
>>> Up to DDR4 3200 MT/s
>>> Up to LPDDR5/x 6400 MT/s
>>> Up to LPDDR4x 4267 MT/s
>>> Max # of Memory Channels 2
>>> ECC Memory Supported: No ("we is Intel, we don't do ECC")
>>>
>>> When the DDR5 offering is a weird number, you select the
>>> nearest power-of-two below that to develop your own DDR4 limitation value.
>>>
>>> It's Intel Flex Memory, so combinations will work. Or matched sets will work.
>>>
>>> Plug and play.
>>>
>>> Test with Memtest.
>>>
>>> Please ignore the excessive and stupid advertising on this page.
>>>
>>> https://www.memtest.org/
>>>
>>> Look to the right hand side bar, for choices.
>>>
>>> Windows USB Installer (32/64 bits) <=== direct to USB key
>>>
>>> Linux ISO (32 bits) <=== make a CD or Rufus to a USB key
>>>
>>> Linux ISO (64 bits) <=== make a CD or Rufus to a USB key
>>>
>>> Linux ISO w/ GRUB (64 bits)
>>>
>>> Binary Files (.bin/.efi)
>>>
>>> Source code (.tar.gz)
>>> Used to build these binaries
>>>
>>> The executable code for that, is normally small.
>>> It used to fit on a floppy :-) On a floppy without
>>> a file system (direct boot into binary).
>>>
>>> Test before adding your new DIMM.
>>>
>>> Test after adding your new DIMM.
>>>
>>> Compare the bandwidth numbers in the upper left of the screen.
>>>
>>> *******
>>>
>>> You can also get some info about the existing DIMM inside
>>>
>>> https://www.cpuid.com/softwares/cpu-z.html
>>>
>>> ZIP English
>>>
>>> With the cpuid.ini next to the cpuid.exe , you can
>>> run it and it has an interface to report RAM details
>>> (for your one stick). One of the panels has a "Save"
>>> option and the text file can be mined for materials
>>> to copy and paste.
>>>
>>> Paul
>>
>>
>>
>> Thanks to all. I fitted it and its bios recognises the new module.
>> Now I have 24 GB RAM.
>
>Do you notice any improvement in performance?
>There might even be a degradation in performance, given the RAM
>configuration you've adopted.
>
>Ed

Good evening all,

I saw a bit faster boot times. But at least I will not run out of RAM
for the foreseeable future.

On 4/24/2024 1:35 PM, Ed Cryer wrote:
> Dan wrote:
>> On Wed, 24 Apr 2024 06:19:21 -0400, Paul <nospam@needed.invalid>
>> wrote:
>>
>>> On 4/24/2024 3:59 AM, Dan wrote:
>>>> Good morning all,
>>>>
>>>> I just bought a Dell Latitude 5440 as it has two RAM slots. One is
>>>> populated by a DDR4 16GB sodimm.
>>>> But I have a spare sodimm of this spec:
>>>>
>>>> https://www.amazon.co.uk/SK-Hynix-2666MHz-HMA81GS6JJR8N-VK-Sodimm/dp/B07TN25C63
>>>>
>>>> SK Hynix 8GB 2666MHz HMA81GS6JJR8N-VK Sodimm Memory Module
>>>>
>>>>
>>>>
>>>> HMA81GS6JJR8N-VK - SK Hynix 1x 8GB DDR4-2666 SODIMM PC4-21300V-S
>>>> Single Rank x8 Module
>>>>
>>>>
>>>> Description
>>>>
>>>>      HMA81GS6JJR8NVK
>>>>      MEMORY MODULE
>>>>      SINGLE RANK
>>>>      8 GB
>>>>      UNBUFFERED
>>>>      CL19
>>>>      260-PIN
>>>>      SODIMM
>>>>      1.2 V
>>>>
>>>>
>>>> Will this fit and work in my new laptop?
>>>>
>>>
>>> It's not this machine, because the processor here takes DDR3 memory.
>>>
>>>   Dell Latitude E5440, Intel Core i5-4300U
>>>   (Fourth gen Haswell, DDR3, so not your machine)
>>>
>>> This might be your machine.
>>>
>>> https://www.dell.com/en-ca/shop/laptops-ultrabooks/latitude-5440-laptop/spd/latitude-14-5440-laptop
>>>
>>> The Dell URL teases us with tasty processor. We write it down.
>>>
>>>    13th Gen Intel Core i5-1335U
>>>    (12 MB cache, 10 cores, 12 threads, up to 4.6 GHz Turbo)  2 performance cores 8 efficiency cores
>>>
>>> A check on ARC gets us a reference:
>>>
>>> https://ark.intel.com/content/www/us/en/ark/products/232153/intel-core-i5-1335u-processor-12m-cache-up-to-4-60-ghz.html
>>>
>>> Memory Specifications
>>>
>>>     Max Memory Size (dependent on memory type) 96 GB  <=== DDR5 (not your  machine) limit
>>>     Memory Types Up to DDR5 5200 MT/s                      ( DDR4 Limit would be 64GB or 2x32GB SODIMM )
>>>     Up to DDR4 3200 MT/s
>>>     Up to LPDDR5/x 6400 MT/s
>>>     Up to LPDDR4x 4267 MT/s
>>>     Max # of Memory Channels 2
>>>     ECC Memory Supported: No ("we is Intel, we don't do ECC")
>>>
>>> When the DDR5 offering is a weird number, you select the
>>> nearest power-of-two below that to develop your own DDR4 limitation value.
>>>
>>> It's Intel Flex Memory, so combinations will work. Or matched sets will work.
>>>
>>> Plug and play.
>>>
>>> Test with Memtest.
>>>
>>> Please ignore the excessive and stupid advertising on this page.
>>>
>>> https://www.memtest.org/
>>>
>>> Look to the right hand side bar, for choices.
>>>
>>>    Windows USB Installer (32/64 bits)   <=== direct to USB key
>>>
>>>    Linux ISO (32 bits)                  <=== make a CD or Rufus to a USB key
>>>
>>>    Linux ISO (64 bits)                  <=== make a CD or Rufus to a USB key
>>>
>>>    Linux ISO w/ GRUB (64 bits)
>>>
>>>    Binary Files (.bin/.efi)
>>>
>>>    Source code (.tar.gz)
>>>    Used to build these binaries
>>>
>>> The executable code for that, is normally small.
>>> It used to fit on a floppy :-) On a floppy without
>>> a file system (direct boot into binary).
>>>
>>> Test before adding your new DIMM.
>>>
>>> Test after adding your new DIMM.
>>>
>>> Compare the bandwidth numbers in the upper left of the screen.
>>>
>>> *******
>>>
>>> You can also get some info about the existing DIMM inside
>>>
>>> https://www.cpuid.com/softwares/cpu-z.html
>>>
>>>    ZIP English
>>>
>>> With the cpuid.ini next to the cpuid.exe , you can
>>> run it and it has an interface to report RAM details
>>> (for your one stick). One of the panels has a "Save"
>>> option and the text file can be mined for materials
>>> to copy and paste.
>>>
>>>    Paul
>>
>>
>>
>> Thanks to all. I fitted it and its bios recognises the new module.
>> Now I have 24 GB RAM.
>
> Do you notice any improvement in performance?
> There might even be a degradation in performance, given the RAM configuration you've adopted.
>
> Ed

It's an Intel. It should be quite resistant to shaming :-)

Some of his memory space will be dual channel now. That
should count for something. If it were to make a difference,
you might see it in a 7ZIP compression run (number of compression
threads times 600MB, during Ultra compression). The dictionaries
living in the dual channel section should be a bit faster.

But testing this scenario, is generally a pain in the ass. You
can't tell what's going on when you run some of the tests. (Where
the test element is sitting in the memory space. There is virtualization
and renumbering going on.)

One test I did long ago, was to modify memtest to dump bandwidth
numbers for various areas of RAM. And the values I measured were
like this:

+----------------------------+ 900
| single channel memory area | 900
+----------------------------+ 1400
| dual channel memory area | 1400
| | 1400
+----------------------------+ 1400 <=== the dual channel isn't quite twice as fast

But modern computer design, just tends to pave over that sort of detail.
To the OP, it would feel like a "transition from 16 to 24" and that's
about it. Any unevenness in speed, might not be (reliably) measurable.
The Yahoo News page opens with the same speed it always did.

Paul

Paul wrote on 4/24/24 12:31 PM:
> On 4/24/2024 1:35 PM, Ed Cryer wrote:
>> Dan wrote:
>>> On Wed, 24 Apr 2024 06:19:21 -0400, Paul <nospam@needed.invalid>
>>> wrote:
>>>
>>>> On 4/24/2024 3:59 AM, Dan wrote:
>>>>> Good morning all,
>>>>>
>>>>> I just bought a Dell Latitude 5440 as it has two RAM slots. One is
>>>>> populated by a DDR4 16GB sodimm.
>>>>> But I have a spare sodimm of this spec:
>>>>>
>>>>> https://www.amazon.co.uk/SK-Hynix-2666MHz-HMA81GS6JJR8N-VK-Sodimm/dp/B07TN25C63
>>>>>
>>>>> SK Hynix 8GB 2666MHz HMA81GS6JJR8N-VK Sodimm Memory Module
>>>>>
>>>>>
>>>>>
>>>>> HMA81GS6JJR8N-VK - SK Hynix 1x 8GB DDR4-2666 SODIMM PC4-21300V-S
>>>>> Single Rank x8 Module
>>>>>
>>>>>
>>>>> Description
>>>>>
>>>>>      HMA81GS6JJR8NVK
>>>>>      MEMORY MODULE
>>>>>      SINGLE RANK
>>>>>      8 GB
>>>>>      UNBUFFERED
>>>>>      CL19
>>>>>      260-PIN
>>>>>      SODIMM
>>>>>      1.2 V
>>>>>
>>>>>
>>>>> Will this fit and work in my new laptop?
>>>>>
>>>>
>>>> It's not this machine, because the processor here takes DDR3 memory.
>>>>
>>>>   Dell Latitude E5440, Intel Core i5-4300U
>>>>   (Fourth gen Haswell, DDR3, so not your machine)
>>>>
>>>> This might be your machine.
>>>>
>>>> https://www.dell.com/en-ca/shop/laptops-ultrabooks/latitude-5440-laptop/spd/latitude-14-5440-laptop
>>>>
>>>> The Dell URL teases us with tasty processor. We write it down.
>>>>
>>>>    13th Gen Intel Core i5-1335U
>>>>    (12 MB cache, 10 cores, 12 threads, up to 4.6 GHz Turbo)  2 performance cores 8 efficiency cores
>>>>
>>>> A check on ARC gets us a reference:
>>>>
>>>> https://ark.intel.com/content/www/us/en/ark/products/232153/intel-core-i5-1335u-processor-12m-cache-up-to-4-60-ghz.html
>>>>
>>>> Memory Specifications
>>>>
>>>>     Max Memory Size (dependent on memory type) 96 GB  <=== DDR5 (not your  machine) limit
>>>>     Memory Types Up to DDR5 5200 MT/s                      ( DDR4 Limit would be 64GB or 2x32GB SODIMM )
>>>>     Up to DDR4 3200 MT/s
>>>>     Up to LPDDR5/x 6400 MT/s
>>>>     Up to LPDDR4x 4267 MT/s
>>>>     Max # of Memory Channels 2
>>>>     ECC Memory Supported: No ("we is Intel, we don't do ECC")
>>>>
>>>> When the DDR5 offering is a weird number, you select the
>>>> nearest power-of-two below that to develop your own DDR4 limitation value.
>>>>
>>>> It's Intel Flex Memory, so combinations will work. Or matched sets will work.
>>>>
>>>> Plug and play.
>>>>
>>>> Test with Memtest.
>>>>
>>>> Please ignore the excessive and stupid advertising on this page.
>>>>
>>>> https://www.memtest.org/
>>>>
>>>> Look to the right hand side bar, for choices.
>>>>
>>>>    Windows USB Installer (32/64 bits)   <=== direct to USB key
>>>>
>>>>    Linux ISO (32 bits)                  <=== make a CD or Rufus to a USB key
>>>>
>>>>    Linux ISO (64 bits)                  <=== make a CD or Rufus to a USB key
>>>>
>>>>    Linux ISO w/ GRUB (64 bits)
>>>>
>>>>    Binary Files (.bin/.efi)
>>>>
>>>>    Source code (.tar.gz)
>>>>    Used to build these binaries
>>>>
>>>> The executable code for that, is normally small.
>>>> It used to fit on a floppy :-) On a floppy without
>>>> a file system (direct boot into binary).
>>>>
>>>> Test before adding your new DIMM.
>>>>
>>>> Test after adding your new DIMM.
>>>>
>>>> Compare the bandwidth numbers in the upper left of the screen.
>>>>
>>>> *******
>>>>
>>>> You can also get some info about the existing DIMM inside
>>>>
>>>> https://www.cpuid.com/softwares/cpu-z.html
>>>>
>>>>    ZIP English
>>>>
>>>> With the cpuid.ini next to the cpuid.exe , you can
>>>> run it and it has an interface to report RAM details
>>>> (for your one stick). One of the panels has a "Save"
>>>> option and the text file can be mined for materials
>>>> to copy and paste.
>>>>
>>>>    Paul
>>>
>>>
>>>
>>> Thanks to all. I fitted it and its bios recognises the new module.
>>> Now I have 24 GB RAM.
>>
>> Do you notice any improvement in performance?
>> There might even be a degradation in performance, given the RAM configuration you've adopted.
>>
>> Ed
>
> It's an Intel. It should be quite resistant to shaming :-)
>
> Some of his memory space will be dual channel now. That
> should count for something. If it were to make a difference,
> you might see it in a 7ZIP compression run (number of compression
> threads times 600MB, during Ultra compression). The dictionaries
> living in the dual channel section should be a bit faster.
>
> But testing this scenario, is generally a pain in the ass. You
> can't tell what's going on when you run some of the tests. (Where
> the test element is sitting in the memory space. There is virtualization
> and renumbering going on.)
>
> One test I did long ago, was to modify memtest to dump bandwidth
> numbers for various areas of RAM. And the values I measured were
> like this:
>
> +----------------------------+ 900
> | single channel memory area | 900
> +----------------------------+ 1400
> | dual channel memory area | 1400
> | | 1400
> +----------------------------+ 1400 <=== the dual channel isn't quite twice as fast
>
> But modern computer design, just tends to pave over that sort of detail.
> To the OP, it would feel like a "transition from 16 to 24" and that's
> about it. Any unevenness in speed, might not be (reliably) measurable.
> The Yahoo News page opens with the same speed it always did.
>
> Paul
>
Imo, even on 64 bit Windows, the jump from 16 to 24 GB is not going to be
noticeable unless the satisfaction of increasing RAM is the variable
being measured.

Also unlikely that 16 GB of RAM was being utilized in the past
- i.e. more RAM(extra 8 GB even if operating in dual channel mode due
the two stick combination) doesn't mean more RAM usage. Efficiency with
dual channel may be present, but measurable and experienced - maybe not.
The sweet spot for Windows 10 and 11 for most devices is 12 GB RAM,
though if gaming is involved, then 16-24 GB may see a noticeable(slight)
improvement in performance and frame rate(but that also depends on the game).

--
....w¡ñ§±¤ñ

>
> Also unlikely that 16 GB of RAM was being utilized in the past
>  - i.e. more RAM(extra 8 GB even if operating in dual channel mode due
> the two stick combination) doesn't mean more RAM usage. Efficiency with
> dual channel may be present, but measurable and experienced - maybe not.
> The sweet spot for Windows 10 and 11 for most devices is 12 GB RAM,
> though if gaming is involved, then 16-24 GB may see a noticeable(slight)
> improvement in performance and frame rate(but that also depends on the
> game).
>
>

The sweet spot is always going to be application dependent.

If you routinely deal with large sound files, picture files or database
tables or you are hosting one or more virtual machines then more RAM
will improve performance - its not all about "gaming"

On Thu, 25 Apr 2024 10:38:20 +0100, Abandoned Trolley wrote:

>> Also unlikely that 16 GB of RAM was being utilized in the past
>>  - i.e. more RAM(extra 8 GB even if operating in dual channel mode
>>  due
>> the two stick combination) doesn't mean more RAM usage. Efficiency with
>> dual channel may be present, but measurable and experienced - maybe
>> not.
>> The sweet spot for Windows 10 and 11 for most devices is 12 GB RAM,
>> though if gaming is involved, then 16-24 GB may see a
>> noticeable(slight)
>> improvement in performance and frame rate(but that also depends on the
>> game).
>>
>>
>>
>
> The sweet spot is always going to be application dependent.
>
> If you routinely deal with large sound files, picture files or database
> tables or you are hosting one or more virtual machines then more RAM
> will improve performance - its not all about "gaming"

I assume the Performance Monitor will show how much memory is in use, and
also show the amount of paging activity.

If there is plenty of free memory and not a lot of paging then adding more
memory may not make much difference.

Cheers

Dave R

--
AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 10 x64

>>>
>>
>> The sweet spot is always going to be application dependent.
>>
>> If you routinely deal with large sound files, picture files or database
>> tables or you are hosting one or more virtual machines then more RAM
>> will improve performance - its not all about "gaming"
>
> I assume the Performance Monitor will show how much memory is in use, and
> also show the amount of paging activity.
>
> If there is plenty of free memory and not a lot of paging then adding more
> memory may not make much difference.
>
> Cheers
>
>
>
> Dave R
>

All of that is true - and has been since the dawn of virtual memory
systems, but does not negate any of what I said earlier.

Ultimately, a "one size fits all" approach to the problem is not going
to provide a solution for everybody

On 4/24/2024 3:31 PM, Paul wrote:
> On 4/24/2024 1:35 PM, Ed Cryer wrote:
>> Dan wrote:
>>> On Wed, 24 Apr 2024 06:19:21 -0400, Paul <nospam@needed.invalid>
>>> wrote:
>>>
>>>> On 4/24/2024 3:59 AM, Dan wrote:
>>>>> Good morning all,
>>>>>
>>>>> I just bought a Dell Latitude 5440 as it has two RAM slots. One is
>>>>> populated by a DDR4 16GB sodimm.
>>>>> But I have a spare sodimm of this spec:
>>>>>
>>>>> https://www.amazon.co.uk/SK-Hynix-2666MHz-HMA81GS6JJR8N-VK-Sodimm/dp/B07TN25C63
>>>>>
>>>>> SK Hynix 8GB 2666MHz HMA81GS6JJR8N-VK Sodimm Memory Module
>>>>>
>>>>>
>>>>>
>>>>> HMA81GS6JJR8N-VK - SK Hynix 1x 8GB DDR4-2666 SODIMM PC4-21300V-S
>>>>> Single Rank x8 Module
>>>>>
>>>>>
>>>>> Description
>>>>>
>>>>>      HMA81GS6JJR8NVK
>>>>>      MEMORY MODULE
>>>>>      SINGLE RANK
>>>>>      8 GB
>>>>>      UNBUFFERED
>>>>>      CL19
>>>>>      260-PIN
>>>>>      SODIMM
>>>>>      1.2 V
>>>>>
>>>>>
>>>>> Will this fit and work in my new laptop?
>>>>>
>>>>
>>>> It's not this machine, because the processor here takes DDR3 memory.
>>>>
>>>>   Dell Latitude E5440, Intel Core i5-4300U
>>>>   (Fourth gen Haswell, DDR3, so not your machine)
>>>>
>>>> This might be your machine.
>>>>
>>>> https://www.dell.com/en-ca/shop/laptops-ultrabooks/latitude-5440-laptop/spd/latitude-14-5440-laptop
>>>>
>>>> The Dell URL teases us with tasty processor. We write it down.
>>>>
>>>>    13th Gen Intel Core i5-1335U
>>>>    (12 MB cache, 10 cores, 12 threads, up to 4.6 GHz Turbo)  2 performance cores 8 efficiency cores
>>>>
>>>> A check on ARC gets us a reference:
>>>>
>>>> https://ark.intel.com/content/www/us/en/ark/products/232153/intel-core-i5-1335u-processor-12m-cache-up-to-4-60-ghz.html
>>>>
>>>> Memory Specifications
>>>>
>>>>     Max Memory Size (dependent on memory type) 96 GB  <=== DDR5 (not your  machine) limit
>>>>     Memory Types Up to DDR5 5200 MT/s                      ( DDR4 Limit would be 64GB or 2x32GB SODIMM )
>>>>     Up to DDR4 3200 MT/s
>>>>     Up to LPDDR5/x 6400 MT/s
>>>>     Up to LPDDR4x 4267 MT/s
>>>>     Max # of Memory Channels 2
>>>>     ECC Memory Supported: No ("we is Intel, we don't do ECC")
>>>>
>>>> When the DDR5 offering is a weird number, you select the
>>>> nearest power-of-two below that to develop your own DDR4 limitation value.
>>>>
>>>> It's Intel Flex Memory, so combinations will work. Or matched sets will work.
>>>>
>>>> Plug and play.
>>>>
>>>> Test with Memtest.
>>>>
>>>> Please ignore the excessive and stupid advertising on this page.
>>>>
>>>> https://www.memtest.org/
>>>>
>>>> Look to the right hand side bar, for choices.
>>>>
>>>>    Windows USB Installer (32/64 bits)   <=== direct to USB key
>>>>
>>>>    Linux ISO (32 bits)                  <=== make a CD or Rufus to a USB key
>>>>
>>>>    Linux ISO (64 bits)                  <=== make a CD or Rufus to a USB key
>>>>
>>>>    Linux ISO w/ GRUB (64 bits)
>>>>
>>>>    Binary Files (.bin/.efi)
>>>>
>>>>    Source code (.tar.gz)
>>>>    Used to build these binaries
>>>>
>>>> The executable code for that, is normally small.
>>>> It used to fit on a floppy :-) On a floppy without
>>>> a file system (direct boot into binary).
>>>>
>>>> Test before adding your new DIMM.
>>>>
>>>> Test after adding your new DIMM.
>>>>
>>>> Compare the bandwidth numbers in the upper left of the screen.
>>>>
>>>> *******
>>>>
>>>> You can also get some info about the existing DIMM inside
>>>>
>>>> https://www.cpuid.com/softwares/cpu-z.html
>>>>
>>>>    ZIP English
>>>>
>>>> With the cpuid.ini next to the cpuid.exe , you can
>>>> run it and it has an interface to report RAM details
>>>> (for your one stick). One of the panels has a "Save"
>>>> option and the text file can be mined for materials
>>>> to copy and paste.
>>>>
>>>>    Paul
>>>
>>>
>>>
>>> Thanks to all. I fitted it and its bios recognises the new module.
>>> Now I have 24 GB RAM.
>>
>> Do you notice any improvement in performance?
>> There might even be a degradation in performance, given the RAM configuration you've adopted.
>>
>> Ed
>
> It's an Intel. It should be quite resistant to shaming :-)
>
> Some of his memory space will be dual channel now. That
> should count for something. If it were to make a difference,
> you might see it in a 7ZIP compression run (number of compression
> threads times 600MB, during Ultra compression). The dictionaries
> living in the dual channel section should be a bit faster.
>
> But testing this scenario, is generally a pain in the ass. You
> can't tell what's going on when you run some of the tests. (Where
> the test element is sitting in the memory space. There is virtualization
> and renumbering going on.)
>
> One test I did long ago, was to modify memtest to dump bandwidth
> numbers for various areas of RAM. And the values I measured were
> like this:
>
> +----------------------------+ 900
> | single channel memory area | 900
> +----------------------------+ 1400
> | dual channel memory area | 1400
> | | 1400
> +----------------------------+ 1400 <=== the dual channel isn't quite twice as fast
>
> But modern computer design, just tends to pave over that sort of detail.
> To the OP, it would feel like a "transition from 16 to 24" and that's
> about it. Any unevenness in speed, might not be (reliably) measurable.
> The Yahoo News page opens with the same speed it always did.
>
> Paul

I was under the impression that the os filled all unused ram with its
pages, thus speeding up the system in general. That is, if its in
memory its fetched much faster than on disk. Your opinions...
Richard

>
> I was under the impression that the os filled all unused ram with its
> pages, thus speeding up the system in general.  That is, if its in
> memory its fetched much faster than on disk. Your opinions...
> Richard

Back in the days of the "resident monitor" that was probably true - but
now ? ...

A lot of people (myself included) are probably running systems which
have enough RAM to hold the entire OS distribution and still leave some
room for an actual program to run - and don’t forget that distribution
would include (among other things) a load of drivers for hardware which
you don’t have.

I doubt if I am the only person who thinks that might not be the best
use of resource.

Algorithms to determine the best bit of RAM to flush when you run out of
space are insanely and notoriously complex - and in some cases will
yield vestigial results which are equally notoriously difficult to measure.

Long ago and far away, I remember reading some technical document from
the team which developed the AMD 29000 RISC CPU. There was a fairly
heavy duty section on the subject of pipeline flushing, which touched on
the business of memory management (and flushing)

The conventional wisdom of the day was that a LRU algorithm would
quickly find the best candidate page for flushing when memory space was
required, so the team set about confirming that theory.

In the course of doing so, they discovered that as long as you don’t
flush the memory page which you are currently executing then it made no
difference that they were able to measure.

On 4/25/2024 9:56 AM, rsutton wrote:

>
> I was under the impression that the os filled all unused ram with its pages, thus speeding up the system in general.  That is, if its in memory its fetched much faster than on disk. Your opinions...
> Richard

There is a System Read Cache.

All OSes have had it.

It was on my Sparc.

When I got my MacG4 Quad Nostril, I did a checksum
on a file. I casually repeated the command (in Terminal).
The command finished in much less time. MacOSX had it.

I spotted the System Read Cache on Win2K next. The beauty of
the Windows implementation at the time, is they took it
seriously. Much of what you would want cached, was cached.
There was a real advantage to System Read Cache back then.

Today, the System Read Cache is not as trusted as it once was.
In Windows at least, the behavior is not as good as it was in Win2K.
Perhaps they are ageing out the cache on purpose, to avoid stale/errored data.

Perhaps this is related to a distrust of computers that don't have ECC.
Should we trust a sector stored in RAM, if the sector was actually
read one week ago... and the RAM has no ECC ? What is the background
error rate on the RAM. Well, for DDR4 or DDR5, the background
error rate is very good.

The System Write cache in Windows, is booked RAM (when the cache fills,
the Task Manager indicates "some of your memory is booked/used". You can
watch the memory graph "deflate" as the system write cache clears out.
But the computer also won't let you use more than about 1/8th of memory
as write cache. There was at least one architecture hole you could
create as a user, where you could cause two processes in Windows
to get into a "death match competition for RAM", and you could
actually freeze Windows. I watched this happen once, but I was
unable to react fast enough to kill one of the consumers in time :-/

System Read Cache is purge-able on demand, so it is the "True Free Lunch"
usage of RAM. Any demand for RAM you might be planning, is not held
back by that feature.

*******

As a general observation, as Windows evolves, we have less and less
reliable information to go on.

I use Process Explorer and its Task Manager, because at least it
shows me the "Memory Compressor" process. It also lists CPU percentages
to two places past the decimal point -- essential for owners of high
core count computers. Otherwise, Task Manager sits there with a
list of "0% for everything", when you can tell from the PC fan
noise, that something is burning cycles.

I use a Kill-O-Watt meter, connected to my daily driver computer.
It reads 36W at idle. On days when "spooky stuff" is going on,
the power meter reads 70W. Now, it's my job to figure out
"who is in the machine, and, what are they doing".

This is how we live in the year 2024.

Nested virtualization is not working, that I can tell. I've tried
a couple times, to do a demo, but no luck. The machine could
have a Windows kernel and a Linux kernel. When I enter "wsl --shutdown",
I expect the Linux kernel to be shut off. But is it ? who
can say, when your Task manager design is "from the last century".

You'll notice there isn't even a decent "arch diagram" for our OS.
Show me some Rings. Show me Ring 3 and Ring 0. Show me how
nesting works. Or is supposed to work, if the driver is ever
completed.

With Hyper-V, the main OS is actually a Guest. That's part
of what an inverted hypervisor brings with it. There *is* a
diagram of the early version of how that works.

But today, the box is just a vast quantity of mystery meat.

When the power meter on my PC reads 70W, I need to understand
where those electrons went. I'm a hardware engineer. It's what
I do, is fret the details.

Paul