The manual for 17 says:
About Audio Monitoring and Audio Input
The audio processing throughout DaVinci Resolve, including on the Fairlight page and audio
processing using Fairlight FX plug-ins, is equally compatible with all platforms that
DaVinci Resolve runs on, including macOS, Windows, and Linux. In particular, DaVinci Resolve
supports audio monitoring and audio input using (i) the audio of a supported
Blackmagic Design I/O device such as an UltraStudio or Decklink, (ii) your macOS, Windows,
or Linux workstation’s on-board audio, (iii) any Core Audio compatible, Windows compatible,
or Advanced Linux Sound Architecture (ALSA)-supported third-party audio interface.
This is not true.
Regarding point (i), you cannot record audio only, but must also have a video signal; ie. you cannot record voiceovers, etc. See:
viewtopic.php?f=33&t=127127&hilit=ultrastudio+xlrRegarding point (iii), there are many inquiries in the forum about incompatible audio interfaces. Specifically, aside from Fairlight hardware, there seem to be few or no professional interfaces that work on Windows. See:
viewtopic.php?f=21&t=125332