Slightly OT

Hi guys, can anyone tell me (or point me where to read about) where in _modern_ PC hardware utilised -5 and -12 volts output? Some old expanshion cards used -12v (DAC/ADC, for instance) - but this was a quite long time ago - what for now?
Sometime, when I repair one of modern PSU, I discover (with great surprise) that -5v line whithin it connect to "air" (e.g goes to "nothing"), and "Health monitor" in BIOS shows something like -61,55v in "-5v" line.
Tnx in advance,
regards, Benny.

PS Sorry for my ugly English.

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