So I've had the GTX 465 running for around 30 min now, will keep it running for a while longer. It seems to use the same drivers as the 980, 344.75 (did a clean install though). I haven't crashed yet, and I even opened up a game to really push it. There are lags, obviously. This is running Driver Verifier. Seems it's the 980 itself causing problems, so I'll take off it off the waterloop, and remount the stock cooler. Unless it crashes within the next hour, that is.
Running the 980 it never passes 10 min, if I recall correctly.