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: