DX 11 Problems

Ive recently bought a new PC and my graphics card (gt340 is apparently DX11 compatible. Now when i set the game to run on DX11 and using the recomended video settings (high on all my screen flickers black. Its not a major problem but i am wondering if this is my PCs way of saying it cant handle the graphics settings or DX11 (plays fine on DX11 but recomended settings drop to good.

My system is using
Windos 7 home premium (64bit
4gb DDR3 ram
intel I5 650 processor

Any help would be awsome.

 
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