4770 Graphics Flickering in Games

Hello, recently I bought a HIS 4770 graphics card. The problem is, when I play some games I get a bizarre graphical error, where random textures on the screen will flicker black and white, and sometimes red. This happens in most games, eg Left4Dead, Empire Total War, Fallout 3. Games where I haven't seen it are Warcraft 3 and Killing Floor. I've tried the 9.5 Catalyst drivers but they don't fix the problem, and I've used driver cleaner to get rid of my old video drivers. I use the catalyst control center program to check temperatures and the video card is not just overheating. I have no idea why this is, and my attempts to google the problem never come up with a solution (I assume because the card is so new very few people have bought the card to have this problem yet). Do you think the card is broken? Maybe it's my motherboard?

Thanks for the help.

Whats the rest of your system specifiations? What is your PSU? Brand/Power/Model etc. Have you monitored temperatures?

You haven't overclocked?

I got the exact card as yours. L4D, COD modern warfare run fine under win xp.

I'm starting to think its a heating problem or something, what do you use to monitor temperatures?

Almost certain it's just flickering and not tearing, I use speedfan for the computer in general but for the video card I use the Catalyst Control Center program which comes with the drivers included on the disk packaged with the video card.