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Typically PSUs have -12V line rated about 0.2 - 0.5A. But for what is it used? Is it used for example with one of the +12V lines to get total 24V? What component or so needs that -12V or possibly 24V?

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In short, it seems -12V is mainly still there because it's part of the ATX specifications and for backward compatibility.

Also see this question on electronics StackExchange: What is the use of negative voltages on a PC motherboard.

-12V used to be necessary for Serial Port voltages (RS232) and was also part of the original PCI bus specifications.

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