I overclocked my 1100T to 4ghz at 200 bus speed and 20x multiplier. However i have not had to raise the voltage at all and it does fine under prime 95 and 3dmark 11. I think it may be because my motherboard a formula iv has max loadline calibration among other things. Is this odd that i shouldnt have to raise the voltage because ive heard people with the same overclock as mine had to go as high as 1.5v and im still at 1.41325v and would raising it or even lowering it if it will still run make it perform any better?
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If you left it on Auto, it's probably raising the voltage. I'd suggest running something like HWMonitor to see where it's actually at under load.