Go into BIOS on new board and enable RAID. Save config and power off. Connect drives, preferably to same SATA ports as on old board. Power on. Array(s) should be immediately supported; verify by doing CTRL-I during this power on and looking at drive status.
Oh yeah? That's great! I was afraid it was storing the config in the BIOS NVRam; if RST stores it all on disk instead then yeah, it should detect the array on the new board :-) I wasn't sure; I unplugged one disk once, and it had to rebuild when I plugged it back even tho nothing had changed. I shall report back once I swap boards. Please be patient, this could take some time...
Woohoo, switched to RAID mode on first power-up and the RAID was detected by the new board. Great! Thank you.