I just got my 2408WFP yesterday and it's a gorgeous monitor at 1920x1200 but I do not have the video card to play games at that resolution at accptible framerates.  However, I'd still like to play games in 16:10 resolution but it appears the only supported 16:10 mode is 1920x1200.  I have video card scaling turned on so in my head I should be able to pick any resolution I want and the video card will scale it to 1920x1200 on output to the monitor, but everytime I try to set a custom resolution the resolution can not be added.

I'd appreciate any help

Dell Dimension 4600
Pentium 4 3.0Ghz
Nvidia 7600 GS AGP 512MB
Soundblaster Live 5.1