Display port Dual link DVI to Gateway XHD3000

The *displayport to dual-link dvi adapter* I bought doesn't seem to work with resolutions > 1920x1200. My Gateway XHD3000 monitor supports upto 2560x1600 but I can't set this resolution in the system preferences. I have set my power setting to "+Better Performance+" hoping the other GPU would be used but still the same lower resolution.
I'm using the Dual-link cable that came with my monitor.
I actually have 2 systems exactly the same with this problem.

Here is what the Gateway Tech support had to say. *Very helpful*....punt!
----------------------- clip
Response (Lonnie S.) - 01/09/2009 12:22 AM
Dear Emmett Bearden,
Thank you for contacting Gateway. I apologize for the inconvenience that you have experienced. If you cannot set the monitor resolution greater than 1920 x 1200 or up to 2560 x 1600, this may occur if your MacBook Pro does not support dual-DVI output, does not support this kind of ultra-high resolution, or does not have the latest video driver. I suggest you please first contact Apple's technical support, to inquire if the MacBook Pro supports this resolution, or if they have a workaround for this problem.
Respectfully,
Gateway Online Technical Support
Customer (Emmett Bearden) - 01/07/2009 12:26 PM
Using my Apple MacBook Pro I'm unable to display a resolution greater that 1920x1200. I bought this monitor for the 2560x1600 resolution. My connection is a dual dvi using the cable that came with the monitor.
Question Reference #090107-001019
Date Created: 01/07/2009 12:26 PM
Last Updated: 01/09/2009 12:22 AM
Status: Solved
Date Purchased: 11/26/2008
Operating System: Other
I need: Technical Support
Serial Number: MWR83B0N00128
Model
XHD3000

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