No 16:9 for external displays

I'm trying to use a 16:9 Plasma display with my G4 PB but the Mac's Display System Prefs do not offer me a 16:9 format option, such as 1280x720. So the aspect ratio is not correct. Am I doing something stupid? I can't believe Mac don't support 16:9 as it's virtually impossible to buy a hybrid display in the UK that isn't 16:9.
P.S. I have also tried it on my G5 but that doesn't offer 16:9 formats either. Has the 16:9 revolution passed unnoticed at Apple HQ?

Check the specs/instructions for the plasma display. Many of them do proprietary internal scaling/stretching voodoo and appear to a computer as a 4:3 aspect display.
Once you've verified any quirks in the plasma display you're working with, you might find either Display Config X or SwitchResX useful.
(-:

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