http://www.pcgamer.com/displayport-vs-hdmi-which-display-cable-should-i-use-for-my-monitor/

Most displays have a ton of video ports on the back, and knowing which is the best choice to connect to your PC doesn’t always come down to sorting cables by price on Newegg or Amazon. Go deep enough and it’s easy to get lost in specifications, version numbers, and other hardware trivia. 

Fortunately, there is a definite hierarchy for gamers when it comes to picking video ports. The simple answer is that you should probably be using a DisplayPort cable to connect your graphics card to your monitor. It offers the best bandwidth and support for adaptive refresh features like G-Sync and FreeSync.