The card (ATI Radeon HD 5870 1024 MB) has 1 dual-DVI port and 2 mini display ports.
https://i.stack.imgur.com/tJF6a.jpg
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
http://en.wikipedia.org/wiki/File:Mini_DisplayPort_on_Apple_MacBook.jpg
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