actually, there is no dual 3d1 card (for a total of 4 GPU) setup.
Not yet there isn't. Go to inquirer.net or .com can't remember which and Nvidia has future plans to allow two of those huge cards to work simultaneously for 4 GPUs at once...hence why I said it
EDIT: Here it is:
Mention of that monster card, PLUS it looks like they might even move to a board with multiple PCI-E slots for more than two graphics cards.....this crap is getting ridiculous. As I've said they need to quit just doubling or even now tripling up crap and focus on making one powerful single GPU.
As it is they are basically working on a card that won't be unveiled in about 2007 (Nvidia had been working on the 6800 since 2002, so they remain about 2 years ahead of actual releases) so perhaps they already are.
Anyway I like to believe this SLI crap is a phase...but with all the time and money they are spending in it who knows..
Heres an idea....how about they make a freakin card which can even utilize the PCI-E 16x bandwidth....