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The card (ATI Radeon HD 5870 1024 MB) has 1 dual-DVI port and 2 mini display ports.

The dual-DVI is hooked up to a 30" 2560x1600 Dell screen. I also have a 27" 2560x1440 screen. Can I hook this new screen up to one of the display ports? Is there a way to get both screens working? Both screens are Dual-DVI only - no other hookups. thanks

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I am seeing that the ports on the 5870 are indeed display ports.… According to the Wikipedia page, they support up to 2560x1600. That means they might work on my Mac, but I have not seen any definitive confirmation that it will work well. – Steve Dorsey Mar 25 '13 at 18:31

Apple Store: Mini DisplayPort to Dual-Link DVI Adapter or similar.

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Yes that should work. And if not, you might have to connect 1 of the screens via DisplayPort and the other via a DVI-to-USB adapter. – bluewoodtree Mar 26 '13 at 3:37

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