A:Answer After the latest firmware update, all 4 hdmi ports are supposed to be hdmi 2.1 capable of 4k/120/hdr but I’ve noticed weird behavior with ports 3 and 4. I originally had my PS5 connected to port 3 but it wouldn’t sometimes give me any sound. After talking with Vizio support I was told to plug the PS5 into port 1 or 2. But since port 1 is EARC, I decided to use port 2. So far, no problems since. Now with my Xbox Series X, I have it connected to port 3. It works for 4k/120/hdr/VRR in theory, but it sometimes does this weird backlight flicker that gets annoying. Other times it will come through as a scrambled signal and I’ll have to turn the Xbox off, then on again for it to correct itself. This happened even when I tried ports 1 and 2 to test. Also, it appears when all gaming features are enabled on Xbox - 4k/120hz/hdr/VRR and you play a game like Black Ops Cold War at 120fps, the tv will skip frames at times. Really weird. I’m hoping Vizio releases another firmware update soon to correct this. But overall for the price, this is a really good gaming tv and movie watching tv with deep blacks and great hdr performance.