Installed the EVGA 1300 G2, and it seems to be OK. I have to do some more testing. One thing I noticed is the fan is kind of loud compared to the antec HCP-1300, which was virtually silent. The 1300 G2 makes a loud audible electrical "whir". Very annoying. I don't know if exchanging it will solve the problem.
Anyways, I seem to have a bad 980Ti. When I installed the new 1300 G2, I fixed up the air-flow in my case. I noticed with all 3 980Tis installed now, 2 of them are only 33C and 44C when running Haven @ 4k maxed out, and one of them always hits 84C when limited, or if I take the limiter off it easily hits 91C. That's even with all 3 fans running @ 100%. I figured I had a bad one, that pretty much confirms it now. I'll have to RMA it.