[kwlug-disc] Upgrading RAM - CAS, latency, ...

[Ron Singh]

Model of mobo and CPU model will help to determine what speed the RAM will
be clocked at.
What is the speed rating of the used DDR3?
As a rule, you *can* use slower RAM, but the entire system will clock down
to accommodate the slower RAM(which you no want).

Thanks,

Ron S.



On Mon, Mar 7, 2022 at 9:44 PM Ronald Barnes <ron at ronaldbarnes.ca> wrote:

>
> Hi,
>
> I'm looking at FreeGeek - they have used DDR3 RAM sticks @ 2x4 GiB for
> $15/each.
>
> My PC has 2x8 GiB DDR3 RAM (1333MHz) (CMZ8GX3M1A1600C10).
>
>
> How concerned to I need to be in matching CAS / latency between current
> and potential newly-used upgrade RAM?
>
>
> The Corsair Vengence page that matches my Product ID:
>
>  >
>
> https://www.corsair.com/us/en/Categories/Products/Memory/High-Performance-Memory/Vengeance%C2%AE-%E2%80%94-8GB-DDR3-Memory-Kit/p/CMZ8GX3M1A1600C10#tab-tech-specs
>
>
> Conveniently, they mention "Tested Latency 10-10-10-27" and " SPD
> Latency 9-9-9-24".  "?"
>
>
> Also, There the speed rating is 1600MHz while lshw shows 1333MHz:
>
>  > description: DIMM DDR3 Synchronous Unbuffered (Unregistered) 1333 MHz
>
>
> All I know is, "do not buy RAM with lower speed than currently installed".
>
>
>
> Can anyone advise me further?
>
>
>
> Thanks!
>
> rb
>
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