Any major performance difference between 1066MHz and 1150MHz RAM?

Any major performance difference between 1066MHz and 1150MHz RAM? I'm currently thinking of upgrading my current gaming machine from it's original 2GB configuration. It's currently using a pair of Kingston HyperX PC2-9200 DDR2 1150MHz RAM (KHX9200D2K2/2G - kit of 2 x 1GB). Performance so far has been quite well and stable on my Intel Q9550.
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Guest [Entry]

"The faster the clock speed the better (assuming your motherboard supports that high of a speed, which yours seems to), but such a small difference will hardly be noticeable I think. The bottleneck is very rarely the memory, so I wouldn't recommend really even looking at the clock speed. Mine is only 400 MHz and I'm doing just fine on Crysis with full settings.

8GB of 1066 MHz memory would be better than 4GB of 1150 MHz memory, especially if you use virtual machines, since those take up a lot of RAM."