Corsair XMS2 DHX DDR2 800MHz 2 x 2GB Review
 

To start off the overclocking on the Corsair XMS2 DHX memory, I started pushing the frequency up by changing the memory dividers on the motherboard BIOS. I was able to get the memory to 1000MHz by loosening the memory timings to 5-5-5-15 and keeping the voltage at 2.1v. I did try to get the RAM to go to 1066MHz by raising the voltage to 2.2v, however it would not remain stable at 5-5-5-15. I was able to get them stable at 6-5-5-18, but the scores were lower than at 1000MHz (5-5-5-15) so that is what I stuck at. The overclocking tests will be run then at 1000MHz with timings of 5-5-5-15 at 2.1v which is a 20% overall overclock for these modules.

http://www.overclockersclub.com/reviews/xms26400/