Soldato
Weird how 3 7970s are faster than 4 680s :/
Quad SLI has never been all that.
Nvidia make dual PCB cards to show off it. They don't make them for people with too much money to use two of and then offer full support on.
I know this only too well, as I have used it (quad SLI).
And in most cases it was slower than using one card.
Not only that, but if the game engine doesn't support it then it will hinder matters. There was an article in a gaming magazine that I read recently about one of EA's new games, and the head CEO for the game itself made a statement to say that whilst he would love to create a multiple GPU version he couldn't see it selling very many units. Thus, he only put in dual GPU support to the game itself.
The game needs to support it, and a good 90% don't. Fallout 3 only sees two, adding any more makes no difference and so on. Adding in that kind of support costs money and takes time. And time is money, so they simply don't bother.