Mac Pro and 1080 LCD projector

I have had little success getting a Hi Def LCD projector to display correct resolution from a MacPro simultaneously running a 23" display from the video card. The Projector displays an extremely pixelated image, while the 23" Apple Display reduces its screen size to a very low resolution. What am I doing wrong? Thanks...

My first thought would be to add the Radeon 2600, it does work in 2007 models running Leopard. And the cost is acceptable.
As long as the X1900 is fine, no need to swap out for the newer 3870 just yet.

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