Dual monitor resolution problem

Hey y'all,
I'm having a problem with my dual monitor setup. On my secondary screen I'm only getting a resolution of 1360x 768 when I should be getting a resolution of 1680x1050. Ubuntu is reading my computer as a laptop (don't know if this affects it). I'm using ubuntu 12.04 with a nividia GeForce 7100 Graphics Card. I've tried installing different drivers and changing the xconf file but still no go. Anybody have any idea of a fix?
Below are images of my nvidia x server settings/configuration/display configuration.
 

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From my experience, dual monitors need to run at the same resolution for the seamless extension
which allows BOTH screens to appear as ONE canvas. The other option just replicates from a->b
and imo is kind off silly.
 
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