I have overclocked the I7 930 using similar parameters and I am getting max 75 deg.
I7 930 OC to 4ghz + Thermalright Ultra-120 eXtreme-1366 cooler
OCZ Gold low voltage 3x2 GB memory @1333 MHz, 1.64V
2x Radeon HD5770 in crossfire
I set CPU ratio to 20, bus speed 200 => 4GHz overclock
CPU voltage however is 1.29 V and memory speed is 1200 (I decreased the multiplier to 8 from 10).
Runs stable, no probs.