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

[CrankyOldBugger]

What Ron says.

You need to duckduckgo both the CPU and MB specs and see what they say
about RAM (one will care about speed, the other about how much you can get,
IIRC)


On Mon, Mar 7, 2022 at 10:08 PM Ron Singh <ronsingh149 at gmail.com> wrote:

> 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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