The Core i7 920 delivers excellent performance at a respectable price range of about $250 - $300. Even at stock speeds, it's a pretty good value, but when you throw overclocking into the mix, the 920 becomes a much more attractive option. Suddenly, with a little work, you can get substantially higher clock speeds compared to what Intel has on the market today, heavily outpacing the $1,000 Core i7 Extreme Edition chip at 3.2 GHz.
If you want to really overclock, you'll want a third party cooler too, which can lop on another $50. Things quickly add up in this new territory, but overall, most can make the move to the Core i7 for under $750 total in most scenarios.
At 4.0 GHz clock speed, the Intel Core i7 920 delivers a great computing experience. While it's tough to tell a difference with small tasks at the stock speed of the 2.66 GHz Core i7 920 processor, the difference in heavy application and gaming performance was immediately noticeable. The system felt slightly snappier overall, although considering the Core i7 920 chip is already pretty fast as is, you'd likely only notice the differences when you really start to tax the system.