It will fit but temps may be a bit off..
You could actually move it to the 2nd PCI-E slot if it's too close to the PSU and only lose a few FPS (2-3% running x16/x4). though it's not the best performance..
To be honest, these power edtions are near GTX 680 performance, so one on its own is pretty close to a 770 anyway.![]()
No the power edition overclocked ones are 680 performance. These are stock clocks.