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FiringSquad did a similar test on memory timings. Their's focused mostly on games at 2 resolutions with single card and Crossfire. They tested DDR2 667 with 5-5-5 timings to DDR2 800 3-3-3 timings and DDR2 1067 5-5-5 timings. Not a huge amount of variation with DDR2 800 3-3-3 and DDR2 1067 5-5-5 obviously coming up on top. Decent DDR2 667 with 4-4-4 timings is quite sufficient for the average person though.For any of the old hands, here's a very, very good article on the difference that memory timings will have, between 4mb and 2mb cache Core 2 Duo processors.
http://www.bit-tech.net/hardware/2006/07/18/core_2_duo_memory_timings/1.html
They're going to do an overclocking review next.