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Well that's strange, when I compared the performance of aes on two different machines,

i7-2600 3.4 ghz windows 7 64-bit with a laptop with core 2 duo t9600 2.8 ghz in single-threaded performance (in a 64-bit linux kernel version 3.3), oddly the core 2 duo is slightly faster by roughly 20-25%.

In other benchmarking of the aesni, such as with truecrypt, there's a roughly 5-10x improvement in cipher performance.

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