Need help overclocking I7 920

Need helping overclocking my I7 920

Hey guys i need help overclocking my intel core i7 920 D0 version to 4.0ghz i really don't understand some voltages such as qpi voltage and so forth, But my current overclock is 3.5ghz stable with 1.248v 20x multiplier and ram at 1400mhz please note i had to down clock the ram to 1400mhz from 1600mhz cause of the BCLK clock.. Every other voltage is set to auto but i don't know about the qpi i don't understand when people say keep it a .05V withen the Vdimm... Also i would like some assistance on achieving this overclock... My system specs are listed below.

GPU- Sapphire Radeon HD 6770 1gb GDDR5 @950mhz/1250mhz 1.200v.
CPU- Intel Core I7 920 D0 @3.5ghz ghz 1.248v. 8 hours prime 95
CPU Cooler- Cooler Master Hyper 212 Evo Push pull with Noctua NF-P12.
MoBo- Asus P6T deluxe version 2.
RAM- 3x2gb Mushkin Blackline DDR3 @1600mhz. 9-9-9-24 1.64v.
PSU- 600 Watt ATX 80+ Bronze certified.

It's probably going to take closer to 1.3 or a bit more to get stable 4.0ghz, although I'm not sure if that hyper 212 plus is going to cut it.

I don't know much about the QPI voltage (I think it's different on X58 motherboards), but leaving it on auto should work fine at 4ghz. Try to use the multiplier more than the BCLK, increase the voltages closer to 1.3v and see what temp you get.

you would need to get your bclk up to a hefty 200 mhz

200 mhz would get your ram to 1600 mhz so it would still be in spec, qpi bus should be set at it's lowest multiplier

i would set IOH/NB to ~1.195, dram to stock, qpi at ~1.4 or auto, vcore to 1.35

if it boots, stress test it and try to get the ioh to ~1.15 and vcore voltages to 1.3 or less if possible


fyi - qpi/dram aka vtt voltage must remain within .5 of vdimm (1.7 dram, 1.2 qpi/vtt)