Texture flickering during games

[elcaro]

Not sure if there is something wrong with my graphics.

But when I was playing Splinter Cell-Chaos theory demo and SWAT 4 demo, I kept getting texture flickers and after awhile the game would crash to a black screen and the only option is to reboot the comp.

I have a Radeon 9800 XT, with the latest driver.

I just had my HD replaced a few days ago and I've never had any problems with texture flickering.

Can anyone help?

[GX1_Man]

Only one post is needed per problem so I am locking this one. Please see responses to the other identical post. Thanks.