ram freaked out cpu

[proman9988]

While back I installed 2gb of Corsair Dual Channel TWINX 2048MB PC6400 DDR2 800MHz E.P.P. Memory (2 x 1024). and it freaked out my cpu making it run at 100%, I orginaly had 2gb of corsair 675mhz ram installed, and I was mixing the two. But I couldnt figure out what was making my cpu freak out and run at 100% usage, was it the mix of the ram or bad ram?? Any one know of a problem of this that would make your cpu run at 100%. Also I ended up fixing the prblem by reinstalling windows on a new hard drive, because the old HDD would take 10min to boot up.

ASUS M2N-SLI Deluxe mobo and a AM2 6400 cpu / windows vista

 

[Yami]

Well, all your RAM is meant to run at the same speed - you should underclock your 800 RAM to 667.

Strange way to fix the problem though, maybe the old XP decided it wasn't happy with the new RAM configuration but a new install was installed for it.