Dual-Link
To the impulsive buyers who might order the screen after the previous paragraph: check if your video card is compatible with the display. Talking to people around me, I noticed that there was a bit of confusion about what “Dual-Link” is. Many people are mixing up Dual-Link and Dual-DVI.
Dual DVI means that there are two DVI connectors on your graphics card. Each of these connector might be Dual-Link or not. Explained with plain words, the single-link DVI connection can carry enough information to build a 1920×1080 pixels image at 60hz. Dual-link DVI doubles the bandwidth and therefore allows a 2560×1600 image to be send from the computer at a frequency of 60hz (or 60 images per seconds).
A single dual-link DVI connector is required to use the maximum resolution of this screen. If a dual-link is not present, a 1280×1024 pixels image will be displayed. Make sure that you connect the monitor on the proper DVI connector as most dual-link cards have two DVI connectors, one of which is not dual-link capable. Note that it is possible to get a dual-dual-Link graphics card capable of driving two 3007WFP monitors (!).
What you need to know: For Crossfire to run you need to plug ALL monitors to the same GPU!
The HD6870 has two DVI Ports! One SL-DVI and one DL-DVI!
For your 2160*1600 resolution you DO need a Dual Link DVI! So you have to use 2 extra Active Adapters!
Either two miniDP-DL-DVI Adapter or one of them and one HDMI-DL-DVI Adapter.
Oh, and i truly hope you got the 2gb HD6870! 6480*1600 pixel is quite big!