I received my Dell 2709w screen today, which is very nice btw, and wanted to test out the HD capabilities. Playing a 720p movie fullscreen results in a very jumpy, jittery playback during panning shots. "Still" shots are mostly okay. Could this be a RAM issue, I can still add 1GB. 15" Macbook Pro, 2.33 C2D 2GB. Screen attached with DVI-D cable. Thanks for any insight!