1.67 GHz PowerBook and 30" Cinema Display

I have a 1.67 GHz PowerBook with the ATI Mobility Radeon 9700 and am trying to run the optimal resolution on a 30" Cinema Display. However, I am unable to chose a resolution higher than 1280. It looks like my VRAM is only 64MB. I do have the dual-link DVI port. Do I need 128MB of VRAM to run the higher resolution?

It looks exactly like the Dual-link DVI diagram found here: http://www.datapro.net/techinfo/dvi_info.html#Page06
My Graphics/Displays in System Profiler read:
ATI Mobility Radeon 9700:
Chipset Model: ATY,RV360M11
Type: Display
Bus: AGP
VRAM (Total): 64 MB
Vendor: ATI (0x1002)
Device ID: 0x4e50
Revision ID: 0x0000
ROM Revision: 113-xxxxx-145
Am I missing something? Could the 64MB version come with Dual-link DVI, but not be enough to power the resolution? Thanks in advance for any help.

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