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Samsung p2270 scrolling and window lag

Answers: Have 2 answers
I have a new 2.8ghz xenon Mac Pro with 6 GB of ram. It's attached to a Samsung P2770HD monitor via a DVI cable.
When I scroll a window in Safari, or drag any window, or even when a new window is opening, it is extremely laggy and redraws the window very slowly. I've tried adjusting all of the monitor settings with no success. I have no options to change in the monitor prefs.
Any advice??
The best answer: I'm using the same monitor on a macpro with the ATI HD 5770 card. I don't have a problem with moving windows but when I set my resolution to 1920x1080 the image goes off the screen. I can't see any of my icons on the far right or left. Do you have that issue?