I bought a Diamond 7970 reference card last year on sale. I have NZXT 750W HALE82 80 plus bronze psu, and my cpu is a i5 3570k running at 4.2ghz. Will my PSU be enough to run 2 7970 cards at stock speeds? Should I go for another reference model? I was planning on getting crysis 3 and bioshock infinite later on, but now they are being offer for free with amd cards. I do game on 5760x1080 and feel the need to max everything on this setup. Dont like having to play BF3 online on low settings to maintain 60 frames in eyeinfinity. Will my PSU be enough to power them? PLZ help.