Those are nice volts and temps, have you had it at 4.0GHz at all?? 445*9 maybe? I'd dearly love to run at 500*8 but the only memory divider that offers any sort of reasonable memory speed is DDR2 1000 which is underclocking
I changed my DDR2 800 to DDR2 1066 because of a similar problem, it just wouldn't stay stable at DDR2 900 (I was running 450*9)
I'm Prime95 Small FFT stable but get a thread stopping at around the 2.5 hour mark when running Blend test, this weekend will be more testing.
I'm going back to 3.0GHz this afternoon after work to find the limits of the memory then back to 4.0GHz to see if it is indeed the memory or NB that is causing the error.
All the fun of the fair, I love overclocking