If you have a 4K Samsung Smart TV ad don’t want to buy a Steam Link device, then you can just install the Steam Link app from the Samsung App Store and you're good to go. The beta version of the app supports 1080p video at 60fps, with 4K streaming support promised in the future. You can play your games using a Steam Controller or Xbox 360 controller. Valve is promising compatibility for additional controllers soon. It's essential you use a wired or high-quality network (at least 5GHZ according to Valve).