So you think it might be more beneficial to cut the Raptor and use the extra money to get a power supply of 850 w or greater? I used a PSU calculator and it recommends 870w.
BTW here's a rather large database of people who overclocked intel processors with varying results. Highest on my combo turned out close to 4 GHz. Not bad.
http://i62.photobucket.com/albums/h9...asterz/db1.gif