I'm looking to buy a used gpu and I'm choosing between GTX 560 and HD 6770. I plan on playing games and video editing specifically trying to play triple A games like GTA 5, Battlefield 4, etc. and Premiere pro cc 2015. I also have a core 2 duo e7400 in which I plan to overclock for the mean time and a 500w power supply. Now I know GTX 560 is the better choice but I want to choose in terms of life span and efficiency. It seems as the HD 6770 performs in lesser power than the GTX 560 so I was thinking maybe this card would survive longer but I'm still tempted to buy the GTX 560 for a better gaming experience. Advices are much appreciated.