Came back to my computer to find one of my nVidia programs had crashed, I assumed the driver crashed while I was away. In addition, Rift was getting random half-second freezes/stutters, which I'm hoping was just the driver as it didn't happen until I started mucking with things. Anyways, rolled back to 314.14 and it seems to be working ok. Successful even after restart. Only weird thing is EVGA Precision X sees the card as "GK104" instead of "GTX 760" - I assume that's fine until new drivers come around.