Alternatively, monitors with DisplayPort multi-streaming support can be daisy-chained together from a single DisplayPort connection on your graphics card, using additional DisplayPort cables to connect the additional monitors to one another. The various displays don't even need to be the same size or resolution.
Can DisplayPort support 3 monitors?
HDMI and DisplayPort are the most common video connections. Different monitors can use different video connections. For example, you can connect two monitors with HDMI and then a third with DisplayPort.