Monitor acts strange ( or graphics card )

Well my monitor, according to catalyst center, supports till 1920x1080 which I use for word, exel etc. If I start a game like 'Crysis Warhead' I can choose till 1920x1080 but if i select anything higher as 1200x1080 the monitor stops and gives an error message, out of range and some frequency's. What's the problem? I have the newest drivers installed, not for my screen.

Screen:

Iiyama s700JT1

Graphics Adapter

HD2900XT 1Gb DDR 3 or 4.
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More about monitor acts strange graphics card
  1. hmm Is it possible that the refresh rate the game is trying to force is too high for the resolution your monitor supports?
  2. I'don't know if thats it, I cant see a refresh rate option in the menu ( using garry's mod ).
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