And? In that case the OP would be better off selling his current 460 and getting a better single card.
I'm never going dual cards again.
I paid £120 for my 460gtx... So if i sell for the same i need to find £230 quid for a 480 gtx... Or £160 for another 460 gtx and they will become cheaper down the line...
Tbh the 460 Gtx plays everything i care to play at 1920x1080 physics on the lot.. so really at the moment have no need for a faster card..