Hi-Fi Man
Senior member
- Oct 19, 2013
- 601
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This PCSX2 forum post shows very limited speed up for AVX over SSE. It's between 0 and 20%.
I couldn't find any Dolphin number.
So yes definitely nice to have, but not something that in its own would make 256-bit width mandatory.
Due to the way emus work being shy of 100% speed can make a game unplayable or not very enjoyable which means that extra percentage is very important.