During my most recent build I upgraded from a Q6600 -- which was a good chip back in its day. This chip SCREAMS, however.
I have it overclocked to 4.5 Ghz on ASUS P8P67 PRO motherboard with 8 gigs of G Skill ripjaws ram using the Asus AI Suite. Windows Experience Index gives this a score of 7.8 in my system. Passmark Software CPU Benchmark (google them) ranks this processor the 7th best performing CPU, in the following order (it was Number 3 when I bought it):
Intel Core i7 990X @ 3.47GHz cpu mark: 10,917 NA
Intel Core i7 995X @ 3.60GHz cpu mark: 10,795 NA
Intel Core i7 980X @ 3.33GHz cpu mark: 10,482 $999.99*
Intel Core i7 970 @ 3.20GHz cpu mark: 9,925 $899.99**
Intel Xeon X5680 @ 3.33GHz cpu mark: 9,721 $1,676.49*
Intel Xeon W3680 @ 3.33GHz cpu mark: 9,655 $1,127.12*
Intel Xeon X5675 @ 3.07GHz cpu mark: 9,326 NA
Intel Core i7-2600K @ 3.40GHz cpu mark: 9,291 $329.99**
Note that three of the CPU's that have better performance scores are NOT commercially available at the current time, and the remaining three processors are three to five times the price of this one. The closest desktop AMD processor is the AMD Phenom II X6 1100T, which has cpu mark scores only in the 6000 range. Passmark also has a price-to-performance chart that rates your best bang for the buck, though many of the highest scoring processors on that chart are simply much slower and much cheaper.
I am very happy with this: it overclocks extremely well and stays very cool. It runs all my programs with blazing speed, including BFBC2 with all settings on high. At 4.5 Ghz and full load, it doesn't go over 38 degrees Celsius.
Get it at this price while they're still available. Highly recommended.