[JoshuaB]

I've been asked to spec out an HPC for my company.

So my use cases are using Ansys products (Fluent and CFX). Thus I am limited in the number of cores I can use, so maximizing performance per core is important.

I am being told by different vendors to go with one or the other of the chips mentioned above. However I'm not sure how much this is salesman bias.

Both have 32 cores/CPU

Clock speed is higher on 9374F (3.85/4.1) (base/all core max) vs. (2.8/4.1) for 8462Y+ (base/max single core).

Both use DDR-5, 4800.

Xeon has 8 memory channels to 12 for for Epyc. However with DDR-5 8 may be enough to keep 32 cores fed, so I'm not sure how much this matters.

So based on raw specifications, I would say a bit of an edge to the 7354F. But I'm being told from some Salesmen that in reality the 8462Y will serve me better. Does anyone know of any CFD comparisons for these two chips?

And for those thinking GPU accelerations, most of my time is spent with CFX AND some of the physics I need are not yet in the GPU version of Fluent.

[flotus1]

I don't have any benchmarks on hand to compare these CPUs.
Based on the raw specs (and the performance trends that emerged over the last few years), I also the 9374F slightly in the lead. 32 cores at 8 channels DDR5-4800 is not a severe bottleneck, but more bandwidth will still help with CFD. And it has larger L3 caches, which also helps. We can't compare cache size 1:1 between entirely different CPUs, but the difference is just too large to ignore (256MB vs 60MB)
Speaking of L3 caches: for maximizing performance per core with CFD workloads, my preferred choice would be the Epyc 9384X. It does not quite reach the clock speeds of the 9374F, but more than makes up for it with 3x the L3 cache size. And in terms of price, it is in the same ballpark as a Xeon Platinum 8462Y.

[FliegenderZirkus]

There's a nice comparison of EPYC 75F3, 7763, 9374F, 9554 and 9654 by Siemens here: https://blogs.sw.siemens.com/simcent...cfd-benchmark/
But this may not help you, because the Xeon 8462Y+ or the mentioned EPYC 9384X are missing.

[trampoCFD]

Hi
How many cores are you limited to?
What size mesh do you typically have?

[Crowdion]

An interesting article by Siemens on effect of L3 cache on CFD performance

CPU Cache and CFD – a Core Friendship