![]() ![]() Pin 14 goes from 0 to 3.7 when PSU switch is turned on. Pin 9 (standby) supply 5V even when PSU is turned off. In addition, some PSU violate color coding of wires. In several power supply units pin-12 may be Brown (not Blue), pin-18 may be Blue (not White), and pin-8 may be White (not Gray). ![]() What is the purpose of the 4-pin Molex connector Definition. To provide extra voltage for a processor. What is the purpose of the 4-pin auxiliary connector on a motherboard Definition. PS_ON activated by pressing and releasing the power button while the power supply is in standby mode. Shorting the pin 14 (/PS_ON) to GND (COM) causes power supply to switch ON. What are the maximum dimensions for a motherboard that uses the Micro ATX form factor Definition. 5 VDC (2002 v1.2 made optional, 2004 v2.01 removed from specification) Each has 12v on 'opposite' pins, and are keyed differently, so confusing the two. Meanwhile, 6-pin GPU has 3x 12v, 2x ground, 1x sense/ground. 8-pin GPU has 3x12v, 3x ground, and two 'sense'/ground. Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF. 8-pin motherboard auxiliary connector Used by an older ATX power supply and motherboard and provided +3.3 volts, +5 volts, +12 volts, 12 volts, and an optional and rarely used 5 volts 20-pin P1 connector Used by ATX Version 2. AthlonX2 said: cpu 8pin has 4 power 4 ground 8pin gpu has 3 power 5 grounds. +12 VDC (may sometimes have a colored stripe to indicate which rail it's on) +5 VDC Standby Voltage (max 10mA) 500mA or more typical 8-pin motherboard auxiliary connector A connector on the motherboard used to provide additional power to the processor other than that provided by the P1. Power Ok is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation (+5 VDC when power is Ok when PSU is turned ON) Current version of ATX12V 2.x power supply provides two connectors for the motherboard: a 4-pin auxiliary connector providing additional power to the CPU, and a main 24-pin ATX 2 power supply connector, an extension of the original 20-pin version. 4 Pin ATX12V Connects to the motherboard ATX 12V socket. Notes: On a 20+4 Pin connector, four of the pins are on a separate block making it reverse compatible with the older motherboards that require only a 20 pin connector. Originally the motherboard was powered by one 20-pin connector. Main power connector for the motherboard. A −5 V output was originally required because it was supplied on the ISA bus, but it became obsolete with the removal of the ISA bus in modern PCs and has been removed in later versions of the ATX standard. Low-power −12 V (☑.2 V) and 5 VSB (standby) (☐.25 V) supplies are also required. The ATX specification requires the power supply to produce three main outputs, +3.3 V (☐.165 V), +5 V (☐.25 V) and +12 V (☐.60 V). Nowdays this standard is obsolete and superseeded by ATX 2.2 (24 pin). In addition to the old AT standard, ATX 2.0 has one extra voltage line available (+3.3V), a connector chain-lined to the single 20-pin and a power-on wire that allows Software to turn off the PSU. ATX specification includes not only Power Supply Unit, but also interface to case and motherboard. ![]()
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