You may think it takes triple PC power to run 3 monitors, well your wrong! imagine a Flight sim , you have 3 viewsports rear side front, that would take tripple power, What a tripple monitor does is uses one viewport from the front takes the same as a single monitor, because the computer does not need to calc and render 3 views it just expands the view in one.
you will need a graphics card with multimonitor ports, and you can get cheap adapters off amazon to convert any ports to HDMI etc...
When I first tried this one monitor did not come on, I found i had to manualy swithch it on in nvidia settings. Nvidia does all the grunt work, it was very easy to setup. you can have a set of 3 32inch monitors thats 96inch display. for quite cheap if you wait for the easter sales . a single monitor is only about 48inch an is a lot more expensive, buy monitors with thin edges.
You will likely need a gaming PC, because it still takes power to run a game, but My PC is 5 years old and everthing runs.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
this is the magic bit, You will find once you enable 5720x1080 resoltion LOTS! and LOTS! of games suddendly have the resolution avalable in the games setting. have a look at my screen shots and check your games the res does not showup unless you have 3 monitors
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I bought the monitors for driving sim, then tried my wargames. Its fun
