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- Aug 12, 2020
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The ATX Standard says 2 pins.
Perhaps in some older version. Linked Intel's design guideline states otherwise.
PSU manufacturers have been doing 3 so the connector can be used as either a 6-pin or 8-pin. I mean, when is the last time you've seen a true 6-pin connector?
PSU manufacturers haven't had true 6-pin connectors in years. They all are 6+2 connectors that have 3 wires so they can be used as either 6-pin or 8-pin connectors.
Multiple low end OEM offerings, in particular from FSP and older Delta made Chieftecs, common on 2nd hand market in my country use them. And those indeed do have 3 +12V wires as shown on pictures from listings.
Even if ATX standard did indeed say about 2 +12V wires, it doesn't even matter, when people actually get 3 wire connectors anyways. Anyway don't see the problem. It's better that way in the first place, and clearly OEMs aren't that greedy to save on that bit of extra wire.