O excellent, thanks, Simon. I’m assuming that the TB3 20Gbps options represent situations where the port the cable’s connected to shares a 40 Gbps bus–something that, as OWC notes, is true of Intel Macs but not of the M1 Macs released so far, where each port is a full 40Gbps.
I don’t think I will ever need to move my TS3+ further away from my M1 Mini than .7m, but am going to check the CalDigit website to see if they note any restrictions on cable length if you’re connecting to a 40Gbps port. Seems like they should. And I guess it may be possible to use a TB4 cable if you go >.8m.