10.14.5 officially released. And this Airplay Display option also officially shows up on our cMP. However, it isn't working yet. My understanding so far is that this function require HEVC hardware encoding. We already have H264 hardware decode, H264 hardware encode, and HEVC hardware decode. The only thing we are missing is the HEVC encoding. Since now this is an official bug in the macOS. I would like to ask all of you to submit a bug report to Apple (via http://bugreport.apple.com ), and hopefully after 5.0GT/s, NVMe bootability, HDMI audio...... we will able to enjoy the full hardware acceleration from our GPU. Thanks!