My card runs great my issue is I get screen lock up for a few seconds every few min

And I can get low fps but I have played so much in CCC and w/ configs could be due to this

So for now no made Rage config and no crap other then remove video in rage start up command line. Does anyone have any idea how to fix this? I did try every fix I could find on line but nothing worked
My box is:
i7 CPU 975
6 gigs ddr 3 ram 1600MHz
Radeon HD 6990 vid card 4GB GDDR5
Screen res is 5896 X 1080 <---samsung MD230x3 monitor
win 7 ultimate 64bit
Sabertooth x58 m/b