Put simply, the title says it all: My rig will not restart Windows after even a mild overclock, the system hangs several times before the POST screen then finally recovers to stock settings and the overclock is lost.
It will boot if I shut it down and restart with the power switch.
It will run 3.2GHz stable (the changes made in BIOS are: FSB set to 356, PCI-E locked to 100MHz, memory set to 2.5:1 from 3.0.)
I pushed the Vcore to 1.34 and this made no difference but the system exibits this behaviour even at a much lower overclock.
According to my experience, the system hang during POST is either due to insane OC or immensely insufficient voltage.
The Vcore is NOT the only voltage you need to tweak for OCing.
What I would do is:
1st: Download the E6600 datasheet at http://www.intel.com/design/core2duo/documentation.htm
2nd: Write down the max(NOT absolute max) voltageS
given in the Electrical Specification section of the datasheet just downloaded.
3rd: Set all the voltages that you are not sure what they do to the max value.
4th: Keep lowering them ONE at a time
until you get instability.OR
Check ( http://www.tomshardware.com/forum/240001-29-howto-overclock-quads-duals-guide
) for detailed guide.