I recently got a Quadcore QX9650 C0 step. I reinstalled Vista 64 after swapping it with a core 2 duo.

now the problem is that with only 2 cores enabled, Super PI completed 32M without errors. When I enable all 4 cores Super PI fails.

I am sure that my RAM does not have any issues. I am using the latest 2801 BIOS.

Btw, in windows XP without OS reinstall, I am getting BSODs randomly.

Any help?