VxDxEEE :
How You are doing this? I have used Intel Xtreme Utility to lower mine till 1.2V and system just crashed (BSOD) during stress test.....
ive actually overclocked mine to 4500 mhz and it is on 1.176 volts and working fine
i stress tested for about 30 mins and no problems
i did it throug bios