i am sorry to get picky on you BUT ground sharing is a HORRIBLE practice and any offenders ought to be castrated!
a ground ought to be able to handle what load is being supplied. in the 12 volt world it wont be a factor but it is still good form to not ground share. but deal if high end professional audio or be connecting 600+ amps for 0/0 cable and it becomes a performance and safety concern very quickly.
I am well aware. The fact is though it CAN handle the load its being supplied. We've got 3 12V and 5 ground. Its just nvidias nutty standard that came up with this, probably due to the ground planes in the PCB but still... and in a PC power supply ground IS ground.
You're of course correct. I am well aware of grounding issues but we aren't dealing with signal processing here.