A:Answer It will work well with a Roku 4. The decision to connect by ethernet or wireless depends on the signal strength of your wireless where you install the Roku. The stronger the wireless signal the faster the wireless-rated speed, up to its capacity in your environment. Roku 4 supports 4k video, which can demand up to 25mpbs of bandwidth (ultra 4k). If you have an easy way to use ethernet cable directly without tearing your house up to run the cable, it's your most reliable bandwidth. The Roku specs say the 4 uses 100mbps for ethernet, which is plenty for any current streaming video needs. However, since this router supports 5GHz and AC speeds, your Roku 4 will also likely work quite well on wireless if you have a good signal where you set it up.