I can use both display port or DVI with 1 display port or the other but not all 3.
When I logged into Windows (as a domain admin), Windows and the AMD software can see the 3rd monitor, but it simply won't display on all 3 monitors at once. While the computer boots up, the BIOS and Windows splash screen shows up on both the diplay port to DVI monitors. I grabbed the latest drivers from AMD and installed the card. The Firepro has 1 DVI port and 2 display ports, and it came with 1 display port to DVI adapter (according to Newegg it is an active adapter but according to a post on an AMD forum, it ships with a passive adapter) so I purchased a second display port to DVI adapter (Newegg didn't say if it was active or passive). I was asked to try to stay under $400 per card, so I got the AMD Firepro v4900 specifically because the datasheet said it supported 3 monitors. So for the user which has 2 monitors, I bought an nVidia Quadros K600 and it seems to working ok. The other user has 3 monitors (all DVI input).
They both have the same computer (HP z400 workstation with Xenon processor, 10 GB RAM, and 1 TB HDD running Win 7 pro 64bit). I was asked to research a replacement video card for our 2 CAD users.
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