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Check out this guide: http://www.overclockers.com/3-step-guide-overclock-core-i3-i5-i7/
It is the definitive resource for 1st gen i7's I was able to get several 920's up to 4ghz, and my trusty old 980x is still kicking it at 4.2.
If you ahve any questions along the way, I am sure they someone will have some insight.
What speed is your ram running it? did you have to "overclock it" to actually get it to higher speeds? I ask because this comes from the same family as a Xeon i recently starting playing with and it only recognizes up to 1066mhz ram according to intel ARK (i7-930 reports the same support).