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Single CPU recommendations for OpenFOAM workstation |
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#1 |
New Member
Join Date: Jul 2022
Posts: 22
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Hello everyone,
I am currently planning research for a paper I am writing. I am an undergrad so my uni will not give me cluster time. I need a pc to run simulations in OpenFOAM. The budget is 2000-2500$ Regarding RAM: I am planning to get 128 or 256 GB, enough to populate all memory channels. If I need to take special care in speed cas latency or whatever, let me know. Regarding the GPU: I understand that a good cpu is not important for CFD, as GPU acceleration is clunky and isn't often implemented. I will just choose a good enough cpu to model with. Maybe an RTX4000, RTX5000, 3070, 3080 or 3090, depending on the budget, how the market progresses these following weeks... Regarding the CPU: I am looking at used Xeons or Epyc CPU's. I stopped considering Threadrippers since they only have quad channel RAM. Xeons seem to have less cache than Epyc, so I am more inclined towards Epyc. The only Xeon that has really caught my attention is the w-3175x, as it has a good base clock and 28 cores. Apart from that, I can't decide between the Epyc 7551p (the cheapest option, I can have it for 200$, and if it performs similarly to the next CPU's it will be my choice), 7402p and 7542p. Maybe I could stretch my budget to get a 64 core, but I feel like there is little improvement past 24 cores having seen some benchmarks. Tell me your opinions. |
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#2 |
Senior Member
Will Kernkamp
Join Date: Jun 2014
Posts: 365
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What kind of openfoam simulations do you plan to do? Some time accurate simulations can run for days. In that case, I would suggest a dual cpu system, because it would double your productivety.
However, if the simulations are typically less than an hour, you might go for a system that also does well for general use. This would mean 16 cores and a high clock for good single thread performance as well as decent CFD performance from 16 cores for eight memory channels. |
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#3 |
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Lourenço SM
Join Date: Jul 2014
Location: Lisboa, Portugal
Posts: 41
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Could you update on your choice?
My personal experience in desktops (intel i7-5820k) is that the number of memory channels are the real bottleneck. Do you agree? Thank you |
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Tags |
cpu, processor, workstation desktop |
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