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If you are currently using a Xfinity/Comcast provided modem and upgrading to this you will definitely notice an increase in internet responsiveness. I recently upgraded to this modem from a previous DOCSIS 3.0 modem and the responsiveness was very noticeable. However, this modem will not increase internet speed above your 800mbs that you pay for. Also, without knowing how your DirecTV DVR is connected to your home network it is difficult to troubleshoot why the unit buffers for 4 k video, If the DirecTV DVR is using wifi then most likely it is a Wi-Fi bandwidth/signal strength issue. In a perfect world the 4K DVR would be connected to the Nighthawk via cat6 ethernet cable.
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