Do you need 2 graphics cards for 3 monitors? - Quora
Plugadget Dual Monitor Video Card 64 Bit 1G GDDR3 AMD Radeon R5 230 Eyefinity Multi-display Graphics Card with Two VGA Output 1080P Support for PC Case Mini ITX ATX HTPC Case -
BCM RX67Q Industrial mATX motherboard now supports the Multi-Monitors feature running six independent displays simultaneously using its onboard graphics and a PCIe graphics card