Not for web surfing, email other and general purpose computer tasks.
For 3D gaming? What gaming resolution are you using?
There are some games where the 2.7GHz 7750 Kuma might be holding back the GTX 460. Those would be CPU intensive games like MMORGs, SIMs, and RPGs.
For FPS and a lot of other games that are GPU intensive there is less chance of the CPU bottlenecking the GPU when all the graphics eye-candy settings are set on high.
I have my 7750 running at 3.0ghz - with a Radion 5770 @ 900/1320, it calc'd out at ~12,500 (Mark06)
(MSI 780GX, 2x2gb Kingston HyperX, 500gb SATA WD green-label)
Personally I was a bit disappointed that it wasn't higher... but, I didn't O'C much at all. I've since returned my 5770 and plan to pick up a 460 when the timing's right.