Can't get native resolution on second monitor in OS X, but can in bootcamp (win 7)

[iimpact]

Here are my hardware specs:

Mac Pro 1,1
NVidia 7300GT (I need a new video card, anyone want to sell me one? [=)
2 x Samsung Synmaster 2494SW (native resolution 1920x1080)


Update:

I booted into windows 7 and I am now able to get both native resolutions.
Though, I am still unable to get both native resolutions (using DVI to DVIs) inside OS X for some reason. In OS X my second monitor is displayed as "VGA Display" and it completely black.

I am not sure why it works in bootcamp using Windows 7, but not in Snow Leopard. I am guessing this is a problem with the OS X configuration.

Anyone have any ideas ?

 

[RebootD]

Is it an HDMI monitor with no DVI? I had an LG Flatron 24in with HDMI and it refused to work with my GT120 at the native resolution in pre-10.6.4. I still have issues with it going to sleep and not waking up, it worked fine attached to a PC with an ATI x1900XT

 

[iimpact]

No, it doesnt have HDMI.

In windows, I'm using the 1080p resolution with two DVIs connected.

Do you think buying the new ati 5770 from apple will fix this problem with OS X ? I called my local store a few hours ago and they have a "few" in stock.

 

[RebootD]

I would suggest you try another monitor first before spending $250 on a video card upgrade.