I've been testing a lot of Corsair RAM, and sadly they seem to have lots of bad modules ... the funny thing is, this only happens with their XMS TwinX series and Dominator .. you'd think it's the top-of-the-line high quality stuff eh? Their value series never give me problems
My experiences obvously differ quite a bit from yours. I've yet to see bad Corsair ram. I use and abuse alot of it too.