https://forums.anandtech.com/threads...#post-39149633
Quote:
RZN vs. CFL vs. SKL-X in X265 2.5+31:
RZN: /w AVX2 = 100.00%, /wo AVX2 = 105.21%
CFL: /w AVX2 = 130.61%, /wo AVX2 = 101.13%
SKL-X: w/ AVX2 = 135.47%, /wo AVX2 = 105.21%
Ryzen's performance without AVX2 is impressive, but it is sad to see that there is still a penalty (like on Excavator) when running 256-bit code.
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I wish somebody would adjust the CPU detection code to disable AVX2 on Zen. Easy performance gain just from that simple change: Zen gets 5.2% faster by disabling AVX2.