Dual 30-inch displays

I have a MacPro with an ATI Radeon 4870 graphics card with a DVI port and a mini Display port. I have an Apple 30-inch display now and have acces to another 30-inch Apple display. Can I use the current card to run both displays at once? I got a mini display port to Dual-link DVI adapter and the mini port did not work for either display, but both displays work on the DVI port. Apple is sending me a new adapter, but my question is, can I display one 30-inch monitor thru the DVI AND one monitor thru the mini port together? Apple does not know. The ATI site is not helpful. If not, what card should I use. Many thanks.

Yes, mDP can drive a 30-inch. What you already tried should have worked and I'm not sure why it didn't. At least you have another adapter coming, but the problem may lie elsewhere besides a defective adapter.
Write back with further details if the second adapter also fails to work.

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