So I recently bought a new PowerColor 7870 and it is an improvement from my PNY 560 Ti. So I assumed I could run everything better with the 7870 seeing how its a better card but I went to play a game and when I turned the AA all the way up to 8x there was so much lag. I got like 18 fps which is annoying. Is there a way to use my 560 Ti as a dedicated AA card? if not then what should I do?