Corsair TwinX XMS4000PRO Review @ Tweaknews

"If you don't already know by now, good quality memory is absolutely an essential part of a stable high performance computer. As the main component transferring data from the CPU to the rest of the computer, it more often than not can be the weak link in the computational chain if a user is experiencing poor overclocking, performance and stability."
I agree, you should keep in mind that these modules have very relaxed timings that enable them to run so fast. For those of use that don't overclock very often you might look into getting a pair of XMS3200LL Pro Modules instead.

Related Web URL: http://www.tweaknews.net/reviews/xms/