:thumbup: Sorry, I don't believe it. The 7900GTX is essentially a 7800GTX fabricated on a 90nm process instead of 110nm. This allows for higher clocks, lower operating temperatures and decreased power consumption. The actual featureset and drivers are identical. If they held it back it was only to allow for detection of Quad SLI in the engine, thats all it could possibly be, but if its Nvidia SLI and ATI Crossfire aware, then it should lookup that to the driver aswell...

... Anyone got any links, this has me intrigued!