Aaah, we'll be hearing so much more in the first week of January one the product actually gets released (read our preview btw). One GTX 295 already is a beast of course. But some GTX 295 SLI tests already have leaked onto the web.
XFastest was able to test two GTX 295 cards on a nice Core i7 965 EE-based system. So that's a Quad SLI setup (each GTX 295 has two GPUs), and what would that return in 3DMark Vantage ? Well, overclocked the two GTX 295 cards at 705 core 1400 shaders 2500 MHz memory and the Core i7 quad-core at 4190 MHz their performance score for Vantage was a whopping 32573 points.
Here at Guru3D we're so trying that as well very soon :)