[Vestdam]

Hi,

I don't have much knowledge on the area, but I can tell you my setup works well!

[flopiflopi]

Thank you for your feedback.

Could anyone comment the difference between AMD EPYC 7573X and 7663.

7573X has 32 cores, clock rate 2.80GHz and a hughe cache 768 MB.

7663 has 56 cores, clock rate 2.00 GHz, a cache of 256 MB and is currently on sale.

Both CPUs has almost the same turbo frequency. Is running on "turbo mode" with good cooling rasonable?

Does larger cache overcome more cores?

[cramr5]

Originally Posted by flopiflopi

Thank you for your feedback.

Could anyone comment the difference between AMD EPYC 7573X and 7663.

7573X has 32 cores, clock rate 2.80GHz and a hughe cache 768 MB.

7663 has 56 cores, clock rate 2.00 GHz, a cache of 256 MB and is currently on sale.

Both CPUs has almost the same turbo frequency. Is running on "turbo mode" with good cooling rasonable?

Does larger cache overcome more cores?

I remember reading that the CFD performance is quite linked to Memory so maybe the bigger cache will help.
I also rememeber that they recommended something like 2 to 4 cores per memory channel. Consireding that EPYC has 8 channels that would bring you to 32 cores per CPU (that's for optimum performance, of course, with more cores you would probably be faster but the gains will start to be less efficient)

[wkernkamp]

Originally Posted by flopiflopi

Thank you for your feedback.

Could anyone comment the difference between AMD EPYC 7573X and 7663.

7573X has 32 cores, clock rate 2.80GHz and a hughe cache 768 MB.

7663 has 56 cores, clock rate 2.00 GHz, a cache of 256 MB and is currently on sale.

Both CPUs has almost the same turbo frequency. Is running on "turbo mode" with good cooling rasonable?

Does larger cache overcome more cores?

The 7573X is the better CPU for CFD, because cores beyond 32 do not add significant performance, but the larger cache speeds up memory access because there is less need for swapping data in and out of RAM.


That having been said, a lower price has a beauty all it's own. The 7663 is also very powerful, so your system would still outperform most others.