Hi,
I don’t have any experience of the 800, so I’m just reading the info for the v4 on Duncan’s site, but that suggests that the V100 card will send its output to the HDMI card.

Brian

Main: G65, MD600 Sooloos, MC200 Roon Core, MS600, 210, 218, UHD722, DSP5200SE, DSP5200HCSE, M6 & DSW.2
System 2: AC200 MS200, WiiM Pro+, M6.
Other: DSP5000 (96/24v1), DSP3300.