|Stephen S 2017-03-09 17:01
The answer is that you are limited by the number of expansion slots on the computer (4 Monitors per card is typical) and the limitations of the manufactures video Driver. Know issue for AMD is that all the monitors on one card must all be the same make and model you should have no issues.
Other issues you will have with windows is if monitors of different shapes and sizes are used it is difficult to match up the resolutions to have it not affect the mouse speed across monitors. Otherwise the Sky Is the Limit