@thyname I can help with the distinction. The PSD 3100 HV is a trickle down of the SDV for sure, and in the following ways:
DAC
SDV: True 1-bit conversion DSD 1024
PSD: Max DSD512
Analog Inputs
SDV: one set balanced, one set RCA
PSD: only one set RCA
Both have one set XLR and RCA for outputs
SDV has multiple digital inputs for certain types (e.g. two USB in) where the PSD only has one.
I’m uncertain if the preamp sections, power supplies, and isolation technologies are equivalent across the two, but I can inquire.