I'd like to know if I can run a GTX 770 and a GTX 670 in SLI. If I remember right, they are both based on the GK104 chip, so I think that they can be run in SLI, but the 770 might downclock to match the 670.
If it's not possible, I might run the 770 powering my main monitor, and the 670 running the other two.