UtterDisbelief
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Interestingly some older, basic motherboards came with just the 4-pin plug. It's kind of auxilliary to the main ATX connector anyway, which started as 20-pin and grew 4 more of its own. The auxilliary seems to have grown more pins too so that it could accommodate more recent, power-hungry processors. Previously you could run a system with only the main ATX for power anyway. Things change. Evolution I suppose.No, I wouldn’t do that. While long, long ago in a galaxy far, far away, I did programming work for several years, I’m a retired mechanical engineer with very little contact with electronics hardware.
As an engineer (me too) you might find the Wikipedia article about ATX form-factor and power-supplies educational.
(Yes, it's a bit "dry").
ATX - Wikipedia
en.wikipedia.org