*facepalm*
Ok dude I'd hate to break it to ya but...
Your CPU is a bogus one and is dead, I repeat DEAD.
Not only did you buy a CPU of non-existence name-wise but you were blinded by the magnificence of the ebay page and you put full trust on the seller to provide you an exceptional chip; an exceptional chip yet was killed by about 1.5 volts going across it.
Also, you would've seen a much bigger performance difference if you went and bought a new graphics card; Geforce 8000 series? It's almost been 5 years since those GPUs were released. A sane person would rather go for lets say 580GTX instead of buying a new CPU and keeping their 8600/8800; Why? because CPU's upgrade cycle is longer than GPU's!
So have fun fighting back for that money and good luck; you'll need it.
Good day to you Sir ಠ_ಠ.