Trouble with 1080p on MacOS but no Windows

the maximum I can get out of my intel 20" iMAC with MacOS is 720p. I get some flickering at 1080p. The 59.9HZ option is greyed out and only 60HZ can be used. (incidentally this used to happen with old powermac which had an ATI 9800 and it would flicker with 60 but not 59.9 so 59.9 seems like the right choice).
In Windows, via boot camp, I am able to drive a 1080p signal just fine although apparently at 60HZ.
So, this seems like a driver issue with respect to the ATI card. Anyone else noticed this, or have any ideas?
Thanks
-V

Which version of the ATI card are you using? 128MB or 256MB?
Keep in mind that OS X is much more graphics intensive than Windows XP. OS X will push the limits of your graphics card sooner than Windows. Maybe that is why you are getting the flicker?

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Trouble with 1080p on MacOS but no Windows

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