Originally Posted by L7frost
actually, I'm commpletely sure. The resolution of your monitor is the actual physical number of pixels the monitor can display at max rez, because thats how many pixels the screen has.
This is true. You're physically limited by what the monitor can display. However, drivers can also limit the resolution - if the drivers are only designed to run at 640x480, there's no way for the OS to run a higher resolution than that without different drivers.
This is a problem for Linux users because the ATI drivers for Linux are not particularly good - so there's a good chance that they won't support the 1680x1050 resolution required, even if the monitor itself is perfectly capable of using that.