Doesn't a 7990 use just one PCI slot though where as two 7970's would need two.....As my second slot only runs x4 so thats a lot of lost bandwidth.
Just want to confirm...even though the 7990 is 2 cards on a single slot...does that mean it only uses 1 x 16x? Compared to a normal crossfire combo that would use 1 x 16 and 1 x 16/8/4 depending what you have.
Yes 1x16