Ya though that hasn't been used since the old AT power supplies. The one Neal replaced was an ATX PSU if it was 20 pins, so it shouldn't have that (and it wouldn't be hooked up to the board anyhow)
I'm almost certain its a fan control/monitoring cable, they are about the only tiny 3 pin cable that you might find in a system. If it is and the new one doesn't have the connection then it doesn't matter, the fan in question is the psu's fan which it will handle on its own if there isn't a connector.
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