AMD A10 with EAH6670/DIS/1GD5 crashes if i use GPU Tweaks gaming profile.

The cards standard GPU clock speed is 810 and Memoryclock speed 2000, however the gaming profile tunes it all up to 830 and 4040.

Battlefield 3 runs great, 40 FPS at avarage with these two, but for some reason it still feels kinda sluggish, I cant help it feel that the gamer profile could fix it.

When i switch to the gamingprofile the display goes black. The computer stays on, but the display is black. Sometimes it takes a little time, like when I launch a game or something.

So yeh, it would be just great, if someone could tell me what the heck is going on overe here.