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AMD's Piledriver And K10 CPU Architectures Face Off

Skyrim is a bit weird as when it was first released Bethesda forgot to enable the compiler optimisation flags for the game executable, so basically it didn't use SSE instructions. Intel CPUs are always faster in legacy instructions so this resulted in very poor performance for AMD CPUs. It was fixed in later patches but I have no idea if these benchmarks are performed with the latest patch or not.

This benchmark was done this year, and shows better results, so although they don't give which version it is, it's safe to assume it's got the official patch on:

d2wnh08.png
 
Is it a case of the X6 being slightly quicker clock-for-clock because it has a 'bigger' L3 cache share per core i.e. 8MB over 3, instead of 8MB over 4?

This used to be the case for the X3 (tri-core) Phenom II's.
 
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