I just reaslied if you have a case with 7 pci slots you won't be able to do tri sli or tri fire on air on this board because the 3rd gpu will have to hang off the edge of the motherboard. Apparently the manual says for tri sli or tri fire you need to use red pci-e slot 1, 3 and 4, and it's using the 4th slot which requires the 8th pci-e slot.
I wonder why you can't use red slot pci-e slot 1, 2, and 3. I know bu using slot 2 you will block the short 4x slot intended for sound. I can only guess because slot 2 is intended to be used when you want to do 4 way in 8x8x8x8x mode. Still it seems strange. I'm beginning to think I'm better off holding onto my classified 759 now, as I can run tri fire or tri sli at 16x16x16x, and have a 1x slot on top for sound, or I can do tri sli with physx at 16x16x8x8x or if not using phyx use a full length soundcard and have the 3rd gpu hanging off the end of the board.