Once you've prepared the memory card with the RetroPie image, insert it into the Raspberry Pi, connect the controller, the Wi-Fi adaptor, the speakers and the USB input devices, hook it up to your HDMI monitor, and power it up. Most important of all, make sure you grab some gaming controllers to enjoy the games to the hilt, and RetroPie can work with various controllers, from cheap no-names ones to PS4 controllers and Xbox One controllers. How to get super-fast Wi-Fi in every room.We'll also hook up a compatible Wi-Fi adaptor to the Raspberry Pi, which won't work straight out of the box, but we'll get to that later. You also need a USB keyboard and mouse for some initial setup that you can't do remotely via SSH. You need to transfer this image to at least a 4GB card, either using the dd command in Linux, such as 5 of the most popular Raspberry Pi distros.In addition to Raspberry Pi 3, the distro works with the older models as well, so make sure you grab the correct image. You can manually install RetroPie on top of an existing Raspbian distro but it's more convenient to use the pre-baked image. Just to be on the safe side, try playing games with the default clock speeds, before you try to overclock the Raspberry Pi

How to set up retropie raspberry pi 3