Well, I get 15.5k in 3dmark06 with a slightly faster 8800gts. Not sure about Vantage, since it only allows a limited number of runs on trial version, and I don't want to pay for another benchmarking software.
That's the physx kicking in. I'd expect 6k or so CPU score if you disable physx. Oh, and an 8800GTX with a Q6600 @ 3.0 gets X2800 or so. I don't remember the other scores.