I am currently using a cheap Corsair 1333 CL9 kit. (Borrowed it from corsair for the demo as I didn't have ddr3 yet) The weird thing is that it worked in dual channel for a few days and then 1 morning it started beeping. I am currently typing this message from the computer the blackops is in and I checked all temperatures and nothing is too hot. I'll make a topic for this problem.