yeah I thought with modern PC, either onboard HDMI and or HDMI from GPU I could have dedicated "audio only" from that, then use DP just for video. Nope.
It would mean buying a new AVR and monitor to have HDMI 2.1 support.
Instead had to go back to old PCI-E just to get optical out, as my motherboard lacks it, the steel legend 650E has it, but the Riptide was available. And sods law a week or so I put the system together the Steel Legend came into stock.
Problem is I don't get HD audio codecs
At least for my home cinema I get 4K 60hz, my av pre is HDMI 2.0 spec TV is 2.1 (think) so if I had PC or PS5/Xbox X I'd need to connect it to the TV directly then use E-ARC out...instead of going through the AV pre