I have 4 monitors but when I upgraded to Win 10 I lost that capablity. Trying to regain my 4 monitors.
I had the same issue. This morning 2 x Active MDP to DVI adaptors solved the problem for me.
Accell B087B-006B UltraAV Mini Display Port to DVI-D Single-Link Active Adapter ATI Certified - Black: Amazon.co.uk: Com…
Although it was still a bit of a challenge... Even using the Adaptors windows 10 native didn't really allow me to make the adjustments needed but the catalyst control centre permitted me to make the changes. Using version 15 drivers on 64 bit downloaded from AMD.
The Microsoft recommended driver (from windows update) that it attempted to download rendered all my USB ports unsable and WIndows 10 safe mode (with an SSD) is not easy to get to with a computer you can't control. Had to use remote desktop access in the end to remove that driver.... geez.
So to sum up - 4 monitors working perfectly with Windows 7 and Windows 8 using pasive adaptors but after Windows 10 upgrade I could only get 2 monitors working. I now have 2 passive and 2 acitve adaptors and using CCC I can get the monitors working again.
... I'm yet to reboot - so I hope the settings stick.
best of luck
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