Re 12.3 update... I am having a slightly different problem with freezing.
This may be the wrong thread, but I use a Radeon Pro W5700 and don't want to start another until I know more.
This build is as iMac 20,2,for which (I believe) Radeon Pro W5700 is officially compatible as a build-to-order option.
12.2 runs well. (OC 0.7.8)
My goal was to see if Radeon Pro W5700 is also crippled and report finding. But ran into a worse problem.
Updating a working cloned drive from 12.2 to 12.3, there were 4 reboots, and at the 4th the boot logging went away, replaced by the Apple startup logo with progress bar, then startup stalled with progress at 10% (with "9 mins remaining").
After a long wait with no activity, I reset. Boot continued all the way to desktop, but no Finder menu bar. After about a minute, the system completely froze, no errors, but no mouse, not even CAPS LOCK light.
Booting existing 12.2 drive, everything back to working as before.
One concern I have is that the close drive is a Samsung 980 Pro. Samsung recently released yet another firmware update, which I hoped might correct the macOS Trim boot-delay problem, so I installed it before the upgrade — it doesn't fix the boot delay. But now I'm not sure if that drive might have something to do with this new problem? It seems to work fine and checks out when accessed from working 12.2.
What is best course of action at this time? Is there a bigger problem with Apple supported cards and there will be a 12.3.1, so just wait for that?
I'm getting worn down with hack and updates. PITA
All thoughts appreciated