Hello, this is my first post here. I've got an issue with some new RAM I just bought. I bought 8GB of PC-6400 DDR2 RAM (4x2GB DIMMS). They are Buffalo Firestix. I installed the RAM after I bought it, and the computer wouldn't post. So I removed an reseated the RAM, and it booted fine. It recognized all 8GB. So I ran PCMark 05 under Windows XP Professional x64 to see what kind of performance gain I would get. I left to run an errand and came back to the BSOD. I tried to reboot and it wouldn't. Eventually, I've got it to reboot, and decided to run Memtest from a Ubuntu CD. After 18 hours of testing, there were a massive number of errors and it failed every test. I then removed the DIMMS and tested each one by itself. All four sticks passed. Now I know there isn't a problem with my RAM slots, and that my old RAM is good. I moved from 4GB PC-5300 DDR2. Any one have any suggestions?