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Journeyman III
Journeyman III

Epyc 7282 Memory bandwidth issues

Hello,

We seem to be having a problem with memory bandwidth using 2 Epyc 7282 CPUs with 4 DIMMS of HMA82GR7CJR8 RAM 16GB DDR4-3200 2Rx8 ECC REG DIMM HYNIX memory per socket on a Supermicro H11DSi board. We tried a couple of different benchmarks on Windows an Linux, they show the RAM Bandwidth as ~20 GB/s. We tried playing around with the BIOS settings and managed to get to ~30-40 GB/s. There are 4 DIMMs per socket, and some layouts work better than others. With one CPU and 8 DIMMs we get ~60 GB/s. Can anyone assist us with this issue?

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Big Boss
Big Boss

Re: Epyc 7282 Memory bandwidth issues

The AMD specs for your processor show it is designed for DDR4-3200 

https://www.amd.com/en/products/cpu/amd-epyc-7282 

I suggest changing to that memory timings a tad and see if your able to reduce the latency. Try this idea and I can help you squeeze more out of your server than those posted values

No disrespect, my desktop blows your server away for memory bandwidth.

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