Contrary to several posts on this forum bemoaning its incompatibility, I just installed a Blackmagic Decklink Mini Monitor 4k in my Dell Inspiron 5675 and playback on an external monitor works just fine with both VP 16 and VP 17. My system specs: Windows 10, Ryzen 7 1700X, 32gb, RX 580 GPU. So far I'm getting 60 fps playback from the timeline on my Dell UP2516 monitor without a hiccup. My original footage on the timeline is XAVC-L HD shot at 60fps. I dropped one Boris FX on it and still no lag. You do need to enable GPU rendering for seamless playback though, otherwise you loose lip sync badly. With my GPU acceleration enabled however I get seamless 60 fps playback on my external monitor in full sync. Maybe if I add more FXs playback will start to lag but so far I'm beyond impressed. For $195 the Decklink Mini Monitor 4k does the job and makes a huge difference it you're serious about color grading. Video playback directly from the Vegas timeline to your monitor looks simply amazing!