Specs.
3: 970s
1: 1080
1000 watt psu

So 970s get around 250-270 sols.
I notice one of my cards isn't nearly up to par, running about 170.
I put that card in my gaming pc to make sure it wasn't going bad.

Sure enough, runs great at 270 sols.
Okay. My psu need to be bigger right?

fyi, the other 2 970s and the 1080 perform what they should.
I also run awesomeminer, not sure if that has anything to do with it.