Finally got a chance to do some more testing. My new video card (8800GTS 512) solves the boot problems with the top 16x slot, perhaps it was just an issue with the PCI-e 1.0 cards I had to test with before.
I also replaced all the push-pins with nylon bolts so those should all have better contact than before.
My new problem:
I'm trying to run my Q6600 at 400x6 to make sure I can handle the 400FSB. (This is an attempt to follow AnandTech's quad OC'ing article.) Memory is running at 1:1 for 800 MHz, mem timing & voltages are set to spec. I can run memtest all night but I BSOD & restart within seconds of starting Prime95. No amount of MCH or DDR2 voltage will get it stable, and I tried some absurd levels (1.6 and 2.25). Lower FSB speeds (333 and 366) with ratios resulting in at or near 800MHz memory speeds prime fine.
Any other voltages I should be looking at to successfully run 400MHz? From what I see here 400 shouldn't be difficult for this board & 400 is all I'm really asking for (since I'll end up with either 3.2 or 3.6 GHz, which is more than sufficient for my needs).
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