http://www.apple.com/displays/specs.html
doesn't say what Hz rate at the resolutions it runs
anyone know what Hz rate it does at optimum res for 20"
1680 x 1050 pixels (optimum resolution)
1280 x 800 pixels
1024 x 640 pixels
23"
1920 x 1200 pixels (optimum resolution)
1280 x 800 pixels
1024 x 640 pixels
and 30"
2560 x 1600 pixels (optimum resolution)
2048 x 1280
1920 x 1200
1280 x 800
1024 x 640
cheers