1.85V MCH may need more then just fan cooling. However, to give you an idea I was able to get a 400 FSB OC for a E6850 @ 3.6 to post PC8500 (although it would auto reboot during XP bootup) at 1.75V. I assume 1.85V would make it more stable but I am not sure about cooling needed. Here take a look:
Bios setup
The reason why I post this is because at 1.65V MCH it would not post at all at Dram Frequency of 1000 MHz! However, this 1000MHz dram frequency is not stable.






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