Re: ideal CPU/Memory relation

My understanding is that you'd want "balanced configuration" for your DIMMs if you want max memory performance (and not just amount of RAM).

So, the best is to have an integer multiple of memory channels DIMMs populated. So if you have a single socket Xeon with 6 memory channels, but 8 DIMM slots on the motherboard, for best memory perf you'd put 6 DIMMs there, not 8 (of course, following the vendor guidelines of which slots to populate first). Similarly, if your motherboard has 16 DIMM slots, then you'd populate only 12 slots if your CPU has only 6 memory channels.

https://www.wwt.com/article/memory-population-guidelines-for-intel-3rd-gen-xeon-scalable-processors

Tanel

On Fri, Aug 19, 2022 at 4:40 PM Joe H-Grosse <jhg_at_isnordic.dk> wrote:

> Hi,
> If you/we are talking NUMA Architecture (vs UMA SMP Systems) and DIMM
> population into DIMM sockets within the context of a multi-CPU NUMA
> hardware, then assuming the question asked is "how much RAM is the right
> amount of RAM for a given number of CPU's for a given specific system (X)",
> then part of the answer might be as follows:-
>
>

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