Single Socket 7401 EPYC

queensuCFD · August 2, 2018, 23:15

Hi,

I was wondering if anyone out there has benchmarked an EPYC 7401P single socket setup. Given the EPYC procs already have 8 memory channels, is upgrading to a dual socket system worth the money?

I am currently looking to build a EPYC workstation for OpenFoam, and a single socket 24-core 7401P setup runs about $4600, while a dual proc 7301 setup is a bit over $5800.

I imagine the memory bandwidth is the crux of the single socket setup, however I haven't seen a benchmark for the 24-core system.

flotus1 · August 3, 2018, 05:30

I haven't benchmarked a single-socket Epyc with 24 cores. But based on an educated guess. you will get more than your money's worth for using dual-socket 7301 instead.
OpenFOAM benchmarks on various hardware
Somewhere buried in this thread we had dual-socket 7301 running 16 cores distributed on both CPUs vs. 16 cores pinned to one CPU: 66s vs. 84s. Confirmed by similar results on a machine with only one 16-core CPU.
So clearly, already 16 cores begin to get limited by memory bandwidth of 8 channels (and maybe to some lower extent by cache size).

August 2, 2018, 23:15	Single Socket 7401 EPYC	#1
queensuCFD New Member Matt Join Date: Oct 2017 Posts: 2 Rep Power: 0	Hi, I was wondering if anyone out there has benchmarked an EPYC 7401P single socket setup. Given the EPYC procs already have 8 memory channels, is upgrading to a dual socket system worth the money? I am currently looking to build a EPYC workstation for OpenFoam, and a single socket 24-core 7401P setup runs about $4600, while a dual proc 7301 setup is a bit over $5800. I imagine the memory bandwidth is the crux of the single socket setup, however I haven't seen a benchmark for the 24-core system.

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August 3, 2018, 05:30		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,427 Rep Power: 49	I haven't benchmarked a single-socket Epyc with 24 cores. But based on an educated guess. you will get more than your money's worth for using dual-socket 7301 instead. OpenFOAM benchmarks on various hardware Somewhere buried in this thread we had dual-socket 7301 running 16 cores distributed on both CPUs vs. 16 cores pinned to one CPU: 66s vs. 84s. Confirmed by similar results on a machine with only one 16-core CPU. So clearly, already 16 cores begin to get limited by memory bandwidth of 8 channels (and maybe to some lower extent by cache size).