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The FirePro W5100 GPUs are all able to output up to 4 displays each, but this is contingent on how the monitors are connected to the card. The requirement for this is that the Graphics Cards feature either DisplayPort or Mini-DisplayPort outputs, which your FirePro has. To get 4 display working can only be possible when using either a direct DisplayPort-to-DisplayPort connection, or utilising an active DisplayPort adapter for the 3rd monitor and beyond. The FirePro W5100 cards can only output two legacy/passive outputs at one time! (DVI/HDMI/VGA-passive-adapter-connected monitor)
Using an active adapter instead of a passive adapter utilises a small chip inside the adapter that converts the DisplayPort signal to a signal that is usable by a DVI/HDMI/VGA connection, while still maintaining the DisplayPort standard. If you use a passive adapter, it just converts the DisplayPort output to a legacy/passive output.
For a list of certified adapters, you can refer to www.amd.com/dongles, as these are adapters that our certification team has tested with our cards and found them to be compatible with all AMD products.