Since I build my current system few months ago I couldn't set my comp to sleep due to strange bsod right after waking up. Then it started to bsod on cold boots every morning. Strangely, worked without issues after reboot. Since I've seen a couple of topics about similiar issues, here's how I fixed it: upped memory voltage by 0.05V => rock stable system.:banana: PS haven't had any memtest issues regardless of testing it few times in different circumstances for hours.