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AMD EPYC 7601 Dual Socket Early Power Consumption Observations https://news.ycombinator.com/item?id=14598660 https://news.ycombinator.com/item?id=14598660 htt
by satai 9y ago
AMD EPYC 7601 Dual Socket Early Power Consumption Observations
https://news.ycombinator.com/item?id=14598660 https://news.ycombinator.com/item?id=14598660
https://www.servethehome.com/amd-epyc-7601-dual-socket-early-power-consumption-observations/ https://www.servethehome.com/amd-epyc-7601-dual-socket-early...
- rb808 9y ago> Running an AVX2 workload we were expecting much higher power consumption but at under 500w for 128 threads, this is excellent. eish
- revelation 9y agoGranted the AVX2 performance of the Zen processors is intentionally crippled. It's more of a software compatibility implementation than actual performance boost.
- Recurecur 9y agoCitation?
- revelation 9y agoAgner on microarchitecture [1], page 213, another mention as a bottleneck on page 216: The Ryzen supports the AVX2 instruction set. 256-bit AVX and AVX2 instructions are split into two µops that do 128 bits each. AVX2 increased register width from 128-bit (AVX) to 256-bit, yet Ryzen cores can only process them 128-bit at a time. There is more to AVX2 than just width but that means in comparison to Intel processors, which can do the full 256-bit in a µop, the Ryzen throughput will suffer in tests that heavily emphasize AVX2 instructions (think video encoding). 1: http://www.agner.org/optimize/microarchitecture.pdf http://www.agner.org/optimize/microarchitecture.pdf
- Recurecur 9y agoThanks!