I can't seem to keep my rig stable at the same settings now that I switched to Windows 7 RC1 64 bit. Do you guys think the OS puts more stress on the components being 64 bit, or that it is just not stable?

I was running 191x21@1.35 vcore, but now the voltage has to go up a few notches (along with the temps)

now I've got peak temps of 82 deg C, so I backed off the clocks for now.