Possibly the volts are written on the side of the PSU as in this link ...3.3V, 5V, +12V, -12V , 5V SB standard output in all the older PSU as i remember. https://www.ebay.com/itm/322441051316
No, you were right before... There are actually two +12V rails in the example you showed and one -12V. The pinout for that 24pin connector is standard.
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