Dell laptop with 5 external displays. Graphics are ATI m6000 firepro. Purchased this laptop in 2012 and its still effective.
To get 5 monitors you'll need at least 3 of them using display port or a display port adaptor. I used a 3 port display port hub but it is troublesome. It works fine with 2 monitors only. Plug in your other display port on the laptop itself. Using the dock - full dock, connect either DVI or another DP to the second DP slot. Then use the VGA connector for your last monitor.
Note: 4 external monitors works 100%. When adding the fifth, there are teething pains as the system needs to know how to handle the fifth external as that location is really allocated to the built in laptop display.

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