looks like the card is damaged man, what temps are you getting from it?? From a 7970 GHZ edition you should be seeing much higher fps than that. 20% of the time its just a shitty hdmi/dvi cable, so you could try changing that around. Does this happen in any other game?? You could also try running anti aliasing using catylst control center and see if you get the same results. I remember i was getting stuttering and glitchy screen in skyrim when AA was turned up all the way. Might just be the game.
Thanks for the reply, The DVI cable is not the issue, i've swapped it out. Im not exactly adept in the use of CCC, so im not sure what you mean in regards to 'running anti aliasing using catalyis control center'
I shall try Far Cry 3, and Let you know the results.
@JJ1217 - My power supply is a 650w, not sure of the brand right now and it's difficult to check due to PC placement. Ill try Far Cry 3 or Bf3