Currently what's the best motherboard for a GeForce GTX 690
One which has PCI-e 3.0. Other than that there's not a lot of correlation between motherboards and GPU performance.
Check! I'll keep my eye out for the PCI-e 3.0. And, rest of the motherboard is for amenities. Thanks!
Out of curiosity what is the difference in PCIe x16 2.0 and GTX 690 bandwidth?
Dunno about theoretical bandwidths but there's a good comparison chart here for the 7970. There's not a lot of difference between PCIe 3.0 x16 and PCIe 3.0 x8 (which is equivalent to PCIe 2.0 x16) but bear in mind that the GTX 690 is about twice as powerful. Have to wait and see when the 690 reviews come out.