Graphics Card 3 monitors

Solution
This explains how to do it with nVidia cards (GTX 660 or newer)
http://www.geforce.com/whats-new/guides/how-to-correctly-configure-geforce-gtx-680-surround#1

This is AMD's page about it:
http://support.amd.com/en-us/kb-articles/Pages/MultimonitorFAQ.aspx

Either way, since you're not gaming, I think it's simpler to just buy two cheap cards and connect two monitors to each of them (or two monitors to one and one monitor to the other). Of course, this assumes your motherboard can fit two cards.

 
Solution