Eyefinity and Nvidia Surround requires that all panels output the same resolution. If your panels do not, then the drivers will scale back your panel(s) to the largest common resolution. Hence your x1200 panel is running at 1280x1024 like your side panels, and your total resolution is 3840x1024.
Within my knowledge the only way currently to mix monitor resolutions like you want is with SoftTH, even then I believe SoftTH requires that resolutions match. But that topic is beyond my knowledge. Somewhere to start:
http://widescreengamingforum.com/forum/9241/combine-widescreen-and-normal-screen-th2go
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