[GTX280] Problems , do i need to return ?

[eekfek]

bought an ASUS GTX280 1gig about 4-5mths ago from OcUK installed and worked flawlessly since, however im getting random graphic problems ;-

and

If im playing a game i can still hear it working behind the colourful mess shown above, so im guessing the card is the problem. It happens after 2mins, on launching a game or after a long time playing a game so it seems quite random.. (the card doesn't appear to be overheating either)

ive slapped my old 8800gtx in the box for now and after 30mins all seems fine so ill try the same scenario's using that, can anyone recommend and programs i can run to test the GTX280 or should i pack it up and return under warranty ?

cheers

 

[eekfek]

i guessed as much, least its under warranty and this old 8800 works, thanks for replies