claymore / ethdcrminer64 sorted by physically bus-ID. nvidia-settings sorted by physically bus-ID
It's right way, but is exception, not rule =)
P.S. if I remember correctly - nvidia-settings under Windows (nvcplui.exe) sorted by name.
Under linux - as defined in sections "Device" in /etc/X11/xorg.conf, but I not sure. I check it later.