3 DVI Monitors on HD5770 Card
I want to run 3 DVI monitors from my HD 5770 card. Can I ues the standard Apple Mini DVI to DVI Adapter or does it need to be the £70 Mini DisplayPort to Dual-Link DVI Adapter !
Mac Pro, Mac OS X (10.7.3)
You need two active dvi adapters to drive three monitors on the 5x70 cards.
Read these:
Mac Pro (Early 2009), Mac Pro (Mid 2010): Supported display configurations
If any of them have resolutions less than 1920 x 1200 then you can use single link active adapters. The "AMD Eyefinity Validated Dongles" chart shows some active (and passive) adapters that are acceptable. For example of a single link DVI active adapter is the Accell B087B-006B. An example of a dual link DVI active adapter would be the one from monoprice.com if you need to connect monitors with a resolution greater than 1920 x 1200.
Here's a good explaination of what's going in here and why you need two active adapters on these cards: