Depends on the power supply, usually theres a red switch on the back that says the voltages that I can be. You can also change them by going to the boot setting(setting when the computer boots up)
+5, -5, +12, -12
What are the 5 voltages produced by and BTX power supply? +12v -12v +5v -5v +3.3v
+12V, -12V, +5V, -5V, +3.3V
+3.3v +5v -5v +12v -12v
+12, -12, +5, -5, 3.3 and ground (or 0).
The usual voltages produced by the power supply in a standard personal computer system are 5 volts and 12 volts.For more information see the Related Link shown below.
+10
Maintain constant stable supply and reference voltages.
The voltages supported by a UPS power supply in the US ranges from 50Hz, 60Hg or 400Hg frequency conversions. This may not be an exact answer to the question.
+12v,-12v, +5v, ,-5v, +3.3v and the one seldom used is -5v
The "power supply" supplies power to a computer. A computer's power supply is a "switchmode power supply" responsible for converting the AC voltage from the wall into several DC output voltages.
The Power Supply