OK after 2 hours of Prime95 and 20 runs (~2 hours) of LinX I think my i7 2600K is stable at
4.7 ghz with 1.35v
Just played a Bad Company 2 match ... fps went from ~50 on Athlon II X4 to ~100 on this beast with GPU usage at a nearly constant 100% (same heavily overclocked GTX 480, 1080p 4AA max settings) 3dmark06 score doubled as well, 3dmark11 Physics quadrupled
CoolerMaster CM690 II Advanced filled with : Asus P8P67PRO , i7 2600K, 8 gig Corsair Vengeance 1866mhz, GTX480 with Accelero Xtreme Plus cooling, 80gig Intel Postville SSD & 1+1.5tb hdd's, Corsair HX650, Mugen 2 rev B with Scythe push/pull fans PWM controlled by motherboard, plenty of Yate Loon 120/140 casefans hooked to a "hidden" 5/12 volts switch