When I got the card I used the regular 8.6 drivers with CCC and it kept saying it could not find the correct drivers for the card or something of that sort. So I uninstalled it and found a hotfix driver for the 4800 series. The error messages went away but CoD4 would crash to desktop on me every 10-15 minutes. I then tried the 8.5 but it wouldn't even let me install it so I went back to the 8.6 with just the driver and no CCC. Now CoD4 plays fine and no more error messages and I'm a happy gamer.