This is a 6-pin Molex-type connector (see Figure 3.9). These higher levels ofpower are normally necessary in systems using 250-watt to 300-watt or greatersupplies. The criteria was that if the motherboardneeded more than 18A of +3.3v power, or more than 24A of +5v power, an auxiliaryconnector would be defined to carry the additional load. Melted connectors were becoming more and more common as these wiresoverheated under these loads.įinally, Intel modified the ATX specification to add a second power connectorfor ATX motherboards and supplies. Eventually, the high current demands onthe +3.3v and +5v outputs were proving too much for the number and gauge of thewires used.
In addition, most boards included CPU voltageregulators designed to convert +5v power into the unique voltage levels requiredby the processors the board supported. Inparticular, chipsets and DIMMs were designed to run on 3.3v, increasing thecurrent demand at that voltage. ATX Auxiliary Power ConnectorĪs motherboards and processors evolved, the need for power became greater.
TWO PIN MOLEX CONNECTOR PC
PC Power and Cooling (see the vendor list) sells this type ofadapter. However, because ATX is a superset of the older AT standard, you can use anadapter to allow an ATX power supply to connect to an older Baby-AT stylemotherboard. Therefore, adapting a standard LPX formfactor supply to make it work properly in an ATX system, is difficultifnot impossibleeven though the shapes of the power supplies themselves arevirtually identical. The ATX supply features several voltages and signals not seen before, such asthe +3.3v, PS_On, and +5v_Standby. This is because it shows how they would be oriented if you were back-probing the connector with the connector plugged in.
Note that I like to show these connector pinouts in a wire side view, which shows how the pins are arranged looking at the back of the connector (from the wire and not terminal side). The colors for the wires listed in Table 3.3 are those recommended by the ATX standard however, they are not required for compliance to the specification, so they could vary from manufacturer to manufacturer. First used in the ATX form factor power supply, it also is used in the SFX form factor or any other ATX-based variations. The industry standard ATX power-supplytomotherboard main connector is the Molex 39-29-9202 (or equivalent) 20-pin ATX style connector (see Figure 3.7). Figure 3.6 shows the P8 and P9 connectors (sometimes also called P1/P2) in their proper orientations when connecting.įigure 3.6 The P8/P9 power connectors (sometimes also called P1/P2) that connect an AT/LPX power supply to the motherboard. If any power pins are showing on either side of the connectors, the entire connector assembly is installed incorrectly, which can result in catastrophic failure for the motherboard and everything plugged into it at the time of power-up. A properly installed connector connects to and covers every motherboard power pin.
TWO PIN MOLEX CONNECTOR INSTALL
You must take care, however, to make sure that no remaining unconnected motherboard pins exist between or on either side of the two connectors after you install them. Following the black-to-black rule keeps you safe. Because these connectors usually have a clasp that prevents them from being inserted backward on the pins on the motherboards, the major concern is getting the two connectors in the correct orientation side by side and also not missing a pin offset on either side. Some power supplies have them labeled as P1/P2 instead. All standard PC power supplies that use the P8 and P9 connectors have them installed end to end so that the two black wires (ground connections) on both power cables are next to each other. These supplies feature two main power connectors (P8 and P9), each with 6 pins that attach the power supply to the motherboard.
Industry standard PC, XT, AT, Baby-AT, and LPX motherboards all use the same type of main power supply connectors. Attaching these connectors improperly can have a devastatingeffect on your PC, including burning up both your power supply and motherboard.The following sections detail the motherboard power connectors used by variouspower supplies. This chapter is from the book Motherboard Power ConnectorsĮvery PC power supply has special connectors that attach to the motherboard,giving power to the system processor, memory, and all slotted add-on boards(ISA, PCI, AGP).
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