BSOD Vs. Lockups on Q6600

I'm trying to push my Q6600 a little further.
I've gone from always getting BSOD's with memory dumps, to the PC always locks up and restarts. Does that tell something, or is it just coincidence?

I'm at 412x9 atm, trying to find out how much the CPU will do. I know my board and RAM will do 450Mhz, so it's the CPU thats holding me back now.

Any thought on why I went from BSOD to Lockup's?

more NB voltage? relax your ram timimgs?

Your trying to beat me eh

Well I can run 450Mhz FSB, so I dont think the NB or RAm timings have that much to say, when I'm only running at 412Mhz. Or is that wrong?

I cant beat you with this chip, thats for sure... You dont even wanna know how much voltage I'm pumping through this sucker just trying to get 3.7Ghz stable.