Why is the performance of MKL FFTs on Sandybridge node is 3-5 times faster than Westmere node?
I could think of these 2 reasons
1. Sandybridge has more CPU cores than Westemere
2. May be MKL is smart enough to use the AVX support available on Sandybridge.
Can anyone eplain why the performance of MKL differs between Sandybridge and Westmere?