Hi guys&gals. With my new WC setup in place, and a nice 4163Mhz 24/7 clock achieved, I am starting to look higher. I can boot windows at 4.5Ghz (166X27), but for the life of me I can't get it linx stable there - the system simply reboots. I've tried throwing up to 1.45vcore at it, and still no luck. I am currently running 1.3vtt, 1.33vcore and 1.85v pll at 4163Mhz. Temps at those settings are around 55-57c under linx load and around 32-34c idling with ambient around 25c. When I tried around 1.45vcore at 4.5Ghz, load temps were around 76-78c in linpack before it rebooted itself. I had the CPU at similar temps to this when I was OCin' on air, so it isn't just the temps causing havoc here. I tried 166x26 for around 4.3Ghz, but this chip really hates even multipliers with a vengeance (And it really likes the 166 BCLK), it wouldn't even get to the Vista loading bar before rebooting itself. Does anyone here have experience with D0 i7s around that mark ? What were your vcore, vtt and pll settings ?