HDMI port provides digital output, this means video and audio. If you are trying to use analog audio, this has to be through a cable converter via HDMI or DP.
Have in mind; the board supports analog audio via audio jack:
Analog line-out/Analog Headphone/Analog Microphone (front panel jack)
• Support for 44.1 kHz/48 kHz/96 kHz/192 kHz sample rates on all analog outputs
• Support for 44.1 kHz/48 kHz/96 kHz sample rates on all analog inputs
For additional information about miniDP and HDMI and USB3.0 ports and go here:
@allan_intel: you have not answered any of the questions. I had read an earlier version of the long document you refer to and the spec does detail the relative latency - yet it can be an issue, from reviews I have seen of other PCs.
Regarding my 2nd question, I have the answer, its boot without an OS installed, is same as other PCs.
As I see your Solution ID: CS-033935 states
- Plug the USB keyboard and USB mouse into the rear USB ports.
- Plug the USB flash drive with the Windows image into the front USB port.
is there any difference between the 4 USB3 ports in the way they treat connected items ?