so with the release of the new asus sabertooth gen 3, comes AMD's first pci 3 motherboard. the specs imply that you can run dual x16 cards in pci 3.0 (32gb/s), but i thought that AMD still use HT3.0 which is limited to 20.5 gb/s per direction with a 32bit link. so when crossfireing two modern day graphic cards can you get any performance increase. or would pci 2.0 be just as good. im guessing a single card would benifit, which would be my current configuration, but if i want to crossfire in the future would i just be better off with a pci2.0 board and upgradeing everything when all the parts have caught up with each other 3-4 years down the line.
i have the asus r2 board. i must say in real world scenarios pcie 3.0 offers no discernable difference. its a next gen technology. meaning to say that the board is future proof depending of all the other parts of the mobo. i'd say if you're working with the fx series go for a r2 board or cheaper. in real world pcie 2.0 x16 is the same as pcie 3.0 less a few scenarios. besides i believe the board you are talking about only has support for one true pcie 3.0 lane.