Pfft, the recently released AMD Radeon HD 5870 card's slow already. Check out these pictures
of the ATI Radeon HD 5870 X2
and ATI Radeon HD 5850 X2
cards that will probably be the fastest single card solutions out there. We're talking two RV870 GPUs on one card which is what they did a few weeks after launching the Radeon HD 4870 card a year ago.
A problem though could be the overall length of the card. The 5870's already measure at 11" which takes a pretty sizable case while the X2 cards look even longer. That might be a little issue with some cases out there. The 5850 X2 has a pretty interesting fan setup as well. I'm expecting the 5870 X2 to be in the mid to high $500 range when it's expected to be released in the coming month.