I have a friend who has me helping him build a PC. He's going to put in his entertainment center and use it on his 50 something inch 1080p 600hz plasma TV and play with a controller. Does the 600hz refresh rate mean he could technically get up to 600 fps? I'm not sure if it works the same way for TV's like it does for monitors. Considering the size of the TV should he go with a 4gb 770 or would a 2gb still be sufficient since its still just one display?