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Notes -
This is also manufacturer-dependent; higher-quality power supplies tend to be able to supply the vast majority or all of its rating on 12V alone, while junk PSUs tend to list "500W" but neglect to mention that it can only output 300W as 12V (so from a modern PC standpoint it's only a 300W PSU- the better CPUs can pull 180W 24/7 and even ancient GPUs need about 200W- so if you try that you're already tripping overcurrent... if it even has one, that is).
Basically nothing uses 3.3 or 5V any more (aside from non-NVMe storage), to the point the new ATX standard removes them entirely (instead relying on the mainboard to downconvert 12V input, something it already does for the CPU to turn an input of 12 volts at 15 amps into 1 volt at 180 amps).
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