The cache on intel gets trashed before the cache on phenom, L3 on i7 is 16-way set-associative and on Phenom it is 48-way set-associative.
I think that Bulldozer will have strong prefetchers that works on the L2 cache. The size indicates that they are using that trick to gain speed. Same trick that Intel have worked hard on and as I think, many applications is optimized for.




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