I think there is something wrong with your board. I've playing around for three days now and cannot confirm your problems but i only have a E6600 not a quad. Yesterday i did 8*450 @ ddr 900 @ 4-4-4-10 without problems, the fsb wall on the E6600 is keeping me back, anything over 450 is not stable.
The bios sure isn't finished yet but i only get a freeze when i try oc'ing on the fly (F8) with the wrong settings.
I am getting good pwm temps (60-62) with the E6600
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