Upgrade help needed for smooth 4k video.

4k video plays decent, but a little too choppy for my liking. What will be the best upgrade? ~200 USD budget, but i'd like to keep it as low as possible. No gaming whatsoever.

Currently have:

-MSI H110I Pro
-MSI R7 360 2GD5 OC
-Intel Pentium G4400
-EVGA 500W (100-W1-0500-KR)