Display resolution on external monitor

I have purchased a MacBook Pro 17" and happy with the high screen resolution using it as a laptop. Successfully making my Windows desktop obsolete :-), has left me with a nice Dell 30" monitor (which have been running very high resolutions on using Windows).
I have connected the MacBook Pro 17 via Apple Mini DisplayPort to DVI Adapter and can fine chose between mirror the display or using two display mode. The MacBook Pro also detect the screen fine. But I can't get the resolution on the external monitor higher than 1280X800???? If I use the setup without mirroring, the Mac's own display fine shows 19xx x something, while not displaying an similar high resolution option for the external monitor.
What do I do wrong?
Best regards,
Torben

You need a dual-link DVI cable to get higher resolutions.

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Message was edited by: kmac1036

Display resolution on external monitor

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