Old iMac2017 and HDR
I have an "old" iMac 2017 that is (officially by Apple) NOT HDR.
I don't know if Apple says this only because the Retina 5K display is not HDR or because this computer, although it has a Thunderbolt3 (so is capable of supporting 4k 60hz HDR10 bandwidth) will not support it even with an appropriate dongle adapter.
Today I bought a UsbC-DP 1. dongle (capable up to 8k 60hz HDR) and put it between my iMac 2017 and my Benq PD2700U 4k (60hz, HDR10) monitor. And this is what I am getting (Screenshots from Apple Big Sur Display settings and from "Display Pilot" BenQ proprietary software, running on the same computer.
So.. Am I in HDR or not?
iMac 27″ 5K, macOS 11.1