The Inq writes NVIDIA is planning to sell the GeForce 7950 GX2 graphics cards as single cards. You can of course buy two of them to use them in Quad SLI but one card will work fine too.
We think Nvidia can really give ATI a run for its money here, as it plans to position a two-chip single card against ATI's top-of-the-line Radeon X1900XTX. The Geforce 7950 GX2 card will roughly cost the same or it might end up little more expensive than ATI's but it will certainly outperform a single-chip Radeon X1900 XTX.
It won't be a cheap card to produce but it sure has all the chance of being the fastest one.
The price will be about $599 and it should be available by the end of this month.