u can go upto a gtxtitan/hd7990/gtx690, but tell us what processor and psu do u have? a weak processor can be a bottleneck and a weak psu can damage a power hungry gpu. Tell us your budget and we would be able to help u more accurately.
Well this motherboard has a pci-e 2.0 slot meaning it can work with all modern grapichs.
So the best grapichs card for that motherboard is the best card you can find in the market, which is either a titan or a gtx 690.
u can go upto a gtxtitan/hd7990/gtx690, but tell us what processor and psu do u have? a weak processor can be a bottleneck and a weak psu can damage a power hungry gpu. Tell us your budget and we would be able to help u more accurately.