And it's obvious a 1920X1080 monitor won't be able to display in 1920X1200 in fullscreen without any black edges, the aspect ratio is different. That would be a physical impossibility
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Uh, you got it backasswards. The 1920X1200 monitors display 1920X1080 (which is a TV resolution by the way, not PC) with black bars top and bottom. The Full HD monitors (1920X1080) will not display 1920X1200 at all, unless of course you go non-native which is a serious no-no with LCD's.