Thanks Electric_Eye for the advice. It turns out that one of my 2GB sticks of RAM is bad. Last night I tested each stick individually and with one in particular I was able to reproduce my crash error. What a relief to finally know the cause. So, until I get my replacement RAM I'm running with a single 2GB stick in A1, error free.

Also, I never updated my experience removing the NB heat sink from the board. Cuke2u, this time my experience was the same as yours. With only minor pressure the heatsinks and pipe popped off. Then it was simply a matter of carefully chipping away most of the thermal adhesive with a razor blade, it flaked off quite nicely, and then I replaced the whole thing using my Arctic Cooling MX-2. We'll see how it does when I get my replacement RAM and I'm able to begin overclocking.

Thanks to all for their help, I'm sure I'll be looking for more as I work for a stable air cooled overclock.

Maglin, your setup is virtually identical to mine. I've taken great interest in your post several pages back listing your BIOS settings for a stable 400x9 with minimum voltage. Using the same settings I was able to boot into XP64 without an issue. Failed the OCCT stress test, but the desktop was stable. Then I saw your post several pages later stating that you had to increase some of your voltages to get stable. What settings did you eventually arrive at? Would you mind an updated posting of your stable BIOS settings and/or methodology for getting your stable overclock? Thanks.