i actually ended up buying a second card (9800gtx) and a new psu with no luck ,i tested my ram ,cpu(prime over 24 hours) and same issue .
the weird thing about this problem is that it happens in specific games (hawx,bionic commando ,wolfenstein)
other games like Dark sector,Street fighter,demigod run fine .
i get the same thing as this video
Video - TinyPic - Gratis foto's delen en afbeeldingen & video's hosten
or just black screen depending on game.
This is where i found the solution
AMD Game Forums - Crashes and black screen with gainward HD 4850
More links with people with the same issue
AMD Game Forums - My HD4850 crashes with horizontal/vertical stripes
AMD Game Forums - Radeon HD4850 Crash Vertical Lines!
and there is much more thats why iam welling to try to force these settings if you could help.