Vista - ATI HD4850 display driver stopped working

I started having it too on my ATI HD4850 over the weekend.
new system build i7 920 6gb DDR3 1333 1 TB sata2 drive and a HD4850
works ok as long as not running fallout3 or dawn of war 2
Battlefield 2142 ok but, not as graphicly demanding thou.
On Vista X64 sp1 EX58-UD3R mainboard
was ok saturday ran 8 hours on fallout 3, then sunday
wouldn't even last 10 minutes. Just installed dawn of war 2 major
crashing in startup movie. I got 7 fans so cooling should be good.

all the latest driver updates
just ran GPUZ highest temp was 60 C on any the readings
625mhz 990mhz 100% 2500rpm

My video card blew up during a disk format.
Got new HD4850 everything OK now I can run anything.

Still good temps and no driver warnings or BSoD