So I got a very old game called gtr2. Ive been working on some high detail mods and I want to get more fps and more detail out of it. I am using 2x 660 sc's on normal clock and 2x 8gb 1600 ram running at 1333. I get some fps lag sometimes and want to know if i should disable the sli. I am not sure how to overclock with 2 cards. I got 10000 rpm main drive and run at max of 1600 x 1400. I don't have 3 monitors set up so i wont be doing that yet. Any ideas to increase the fps and quality?