I'm pretty sure each core has its own AVX units for the version they support. AFAIK the only difference between AVX performance (ignoring clock speed) is gold/

I'm pretty sure each core has its own AVX units for the version they support. AFAIK the only difference between AVX performance (ignoring clock speed) is gold/platinum(5000+) Xeons have 2x512 FMA ports available but everything else only supports FMA on port 1/2 and not 5. Stabbing a bit in the dark here, it's been a bit since I was looking at this stuff.