I have a wuxga 1900x1200 and just adding the lines worked for me. If it isn't, your display or video card are probably reporting it unsupported.
Assuming you are using 24bit depth try adding/adjusting these lines in your Screen section.
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1200x800" "1152x864" "1024x768" "800x600" "640x480"
EndSubSection
If that doesn't work check your X server log file for hints. You will probably see out of range messages.
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