I don't believe you need Eyefinity for 2 monitors.
You can use Windows Settings - Display to connect both Monitors and either Duplicate or Extend to both monitors.
Thanks, I already have two monitors set to extend the desktop and that works fine. I'm asking specifically about Eyefinity in order to stretch a single game, specifically Unrailed, across both monitors for a long widescreen effect. Specifically again I'm trying to get a very wide resolution in the game by using two monitors as one.