Hi, my system details are shown in my signature. Have this new Sapphire X1900XT after having an Asus X1800XL. There where only ATI cards in my pc... no possible Nvidia driver problems. After installing drivers 6.4 or 6.5 (same problem), i disabled the 2 services and restarted. I have to use ATITool to set the VGPU to 1,425, and the normal XT speeds of 625/725. After that i can get trough all 3DMarks and play Call of Duty 2. But no other game (BF2, FEAR, etc)... impossible... after clicking in the menu to start those games, the system hangs and turns off the monitor. Tried reinstalling different drivers, and ATITool. Then i tried using ATITool only for the voltage, and "Overclocker" for the clocks. It worked! Can play any game i want. Could it be because the "Overclocker" program relaxes the timings of the VGA and ATITool not? Or is it because the card is too new for this old version of ATITool?