It's happening with regular use, simple web browsing. USB mouse and keyboard seem to be working fine. All stock voltages, 400 FSB (which is stock for the board and the memory, but not for my E5420's). Northbridge rises to 70 and blue screen. I'll have to try with it back down at FSB 333. If it's still a problem there, then I've definately broken something. If broken, I wonder if liquid cooling would be enough to keep it functional?
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Phew! I did some messing around to better align my fans by moving the case front intake to be exactly in line with the eastern CPU, and to make sure that the northbridge fan was not getting buried under heatsink of the western CPU. I also followed the advice posted by someone earlier and disabled system fan control. Seems like it did something, 'cause it's much louder now
But, everything works again!
FSB 400
2 x Xeon e5420 @ 3.0Ghz (stock 2.5Ghz)
All stock voltages
Kingston HyperX 4x1GB
4:4:4:12 @ 2v as per Kingston advertising. I suspect that I can take the voltage back down to stock 1.8. But, that's for another day.
Prime95 blended test after 1.5 hours (and counting, will leave for at least 10-12 hours):
CPU max temps 59,59,60,60 C on one chip, 51,51,56,56 C on other chip.
Northbridge max temps (remote 1, local, remote2 as per CPUID hardware monitor) 51, 43, 63
Memory max temps 46, 48, 52, 47 thanks to triple fan unit.
It was the Northbridge remote2 that had been killing me before, slowly and steadily rising to 70+ before blue screen. Now solidly at 61 - 63.
Given as how I've blown easily 15+ hours researching everything I could on liquid cooling, I may still go down that road. I expect the temps to rise 20+ F once the summer returns, and suspect that my lovely 60's C internal temps won't hold out under those conditions.
I even strongly considered turning the whole works into an aquarium (enough to call and ask about dimensions). But alas, the aquarium kit only fits an ATX board, not an eATX.
http://www.pugetsystems.com/submerged.php