Well I'm getting a higher rez even though my monitor clearly states that it only supports 1440x900. I checked the option to display resolutions my monitor wont support and tried it and some worked.
I dont think they make widescreen CRTs so I am guessing they are LCDs. And if it says you cant support it, but you are trying to force it, it just isnt working. There are only so many pixels on the screen...