Screen flickering at high resolution

I really need help with my graphic card problem. When I run at 1920 x 1080, there were occational horizontal lines on the screen. At 1680 x 1050, there is no problem. Can could there be something wrong with the graphic card? Below is my PC configuaration:

OCZ 4gb ram
XFX HD 5670 1GB 128-bit DDR3
Monitor: HP2311x

I really appreciate your help.
4 answers Last reply
More about screen flickering high resolution
  1. It's probably a defective GPU.
    Try installing the latest drivers or if you can test it in another rig.If neither helped,then RMA it
  2. Might be heat issues. What are your temps?
  3. its probably a defective gpu..though you should try another cable...
  4. Thank you for the suggestion, I will try to RMA it. When I was using my old 1680 x1050 monitor, none of this ever happen. Also, sometimes my computer from sleep or shut up. I am suspecting it's a driver's problem. Any help would be appreciated!
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