I have no clue what the deal is but Im running a single 3870 X2 with the lastest drivers and when I start up COD 4 I get this weird screen drop down. Kinda hard to explain... but if anyone remembers the old TVs where you could control horizontal and vertical and if ya gave it to much horizantal ya would see the line come down from top to bottom along with the screen... so ya see the screen for a split second and then ya see a horizontal line and the screen drop and then it seems normal. Also noticed that sometimes the game would load and be really choppy and would have to reload a few times for it to stop... I have a QX9650 on a Maximus Formula and 2x4GB of Corsair Dominator PC8500 all running at stock speeds.