System is: Opteron 170 @ 2700 MHz Asus A8R32 MVP Deluxe 2GB G Skill 2x x1900xt at Crossfire I have the problem ATI Tool only can clock the cards at the first time who i have installed the programm. When i restart the pc and i make the 3D Mark bench i have only the performance of one card! Whith one card and no crossfire mode the settings are right. In crossfire mode no chance to clock the cards! I have try it with ati tool and then with ati original overdrive tool. with overdrive tool i can try every frequenz but all is the same!! Can anyone help me?