I've been doing a little testing. This seems to be a pretty nice 24/7 setup, the main aim being to restrict the voltage as much as possible. This also has the obvious knock on effect of keeping things cooler too which is also good. I'm working on reducing the vNB now, as it seems the board was struggling at 470 - 499 FSB and now seems much more comfortable at 500 FSB. Setting NB GTL Ref to -40mv also added some stability at 500 FSB.
I realize vdimm reads as 1.98v in the SS, it was flicking between 1.97 - 1.98v under small FFT load, I happened to capture that while it was on 1.98v, but under HCI Memtest load, it sits solidly on 1.97v which represents approximate maximum memory stress.
4250 MHz (500 x 8.5) @ 1.256v / DDR2-1200 @ 1.97v / PL8
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