+3.3 volts +5 volts, +12 volts -12 volts, and -5 volts but -5 is rare
+12V, +5V, +3.3V, -12V, -5V and -5V is rare.
+12, -12, +5, -5, 3.3 and ground (or 0).
What are the 5 voltages produced by and BTX power supply? +12v -12v +5v -5v +3.3v
+12 volt , -12 volt, + 5 volt, - 5 volt, and + 3.3 volt.
ATX, MicroATX, Flex ATX, BTX, and NLX, In that order.
the ATX standard supplies three positive rails: +3.3 V, +5 V, and +12 V
+12V, -12V, +5V, -5V, +3.3V
+12V, -12V, +5V, -5V, +3.3V +12V, -12V, +5V, -5V, +3.3V
The ATX power supply uses 3.3, +5, -5, +12 and -12 volts, plus a common or ground. The +12 and -12 are used by one pin each, so I would guess that would be what you mean by the seldom used. The 3.3 volt is what distinguishes the ATX from earlier power supplies, which only had +5, -5, +12 and -12, plus a common or ground.
An ATX power supply unit delivers power in three voltages: 3.3 volts, 5 volts, and 12 volts. The 3.3 volt pins are used only in the motherboard connector. Older, AT power supplies and motherboards used only 5 volt and 12 volt pins in the motherboard connection.
The ATX power supply and AT power supply had different connections for the computer motherboard. Also the ATX power supply had provision for some parts of the power supply to be switched on-and-off by the electronics on the motherboard, possibly under the control of software. With an AT power supply it necessary for the user to physically operate a switch. This control feature means that a computer that has an ATX power supply can provide, for example, a "wake-on-LAN" or "wake-on-modem" feature whereby the computer will switch itself on if their a signal on the ethernet cable or modem cable. If necessary it should be possible to adapt an ATX power supply to replace an AT power supply. This could be done by finding an adapter cable. The mother board cable from the ATX power supply would then plug into the adapter cable and the adapter cable would plug into the motherboard.
It is an ATX motherboard. But even though it is an ATX size it is a company specific motherboard, and is not compatible with standard ATX cases.
-12, +12, -5, +5 & ground.