Re:AMD’s aggressive pricing update on the EPYC 7371
by gameswithgo on Friday December 07, 2018 @01:10PM
(#18630009)
AVX and AVX512 both do downclocking.
Likely AMD will have to downclock too, pretty fundamental limits at work there.
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Re:AMD’s aggressive pricing update on the EPYC 7371
by hajile on Friday December 07, 2018 @05:29PM
(#18632278)
AMD verified they would be running AVX2 at full clocks. Doing AVX-512 would happen at half-rate, but the processor would continue at full speed. In contrast, skylake downclocks base clocks by 30+%.
Not only does the AVX calculation downclock, but all the other calculations in other ALUs/FPUs also downclock. For pure AVX-512 workloads, Intel would be a little faster, but for mixed loads, AMD should be much faster overall.
AMD says they don't downclock AVX2 (about 2/5 down the page)
https://www.anandtech.com/show/13578/naples-rome-milan-zen-4...
See page 13 for AVX clockspeeds
https://www.intel.com/content/dam/www/public/us/en/documents...