I have decided to go with that PC4000 corsair since my 2 gig pack of OCZ ram won't run stable above PC2700. It runs stable for a good time on Prime 95 at PC2700 but fails in 1 minute at PC3200, so I have decided to go with a faster pack of ram from a better brand. I have tried memtest 86 on the PC2700 speeds and no failures but havent tried it on the PC3200 speeds, but I believe it'd fail in 2 or 3 minutes like Prime 95.