Well now I'm confused. I just exchanged 2 sticks of Corsair Dominator PC8500 (1066MHz) memory from Newegg because they wouldn't pass Memtest86+ at 2.1V and 5-5-5-15 2T timing. The replacements also won't pass, except I've bumped the MCH core voltage from 1.1V to 1.16V and the DDR voltage to 2.16V. In actuality, due to Vdroop the DDR2 voltage is showing 2.14V. When I made these setting changes the memory passed the 8 tests. At this point I believe it is a Vdroop issue rather than bad memory, although I don't know. What do people have their MCH Core voltage at? I'm just suspiscious I'd get two bad pairs of memory from Corsair. Please advise.