Ok, next step would be to use SwitchResX on macOS or CRU in Windows to create 5120x2880 timings between 30Hz and 38Hz using CVT-RB timing. And test each one. Maybe CVT-RB v2 might give an extra frame per second.I tried the 5k39 option (it showed up on the monitor connected with USB-C not the TB3 connected monitor). But it didn't work.
I don't see any reason for audio to be affected. It's a USB device. Probably USB 2.0 so it doesn't require much bandwidth (check macOS System Information.app's USB tab).OK I i got them working again while maintaining the EDID file in effect after restarts etc. But now the audio doesn't work as well (it still loads but buffers intermittently like broken speakers). It was fine all along until all the maneuvers/changes I did. It's happening on both monitors. any ides?
4K60 10bpc = 16 Gbps
5K39 8bpc = 14.5 Gbps
Those leave enough bandwidth for a 20 Gbps connection to do audio.