![]() You can solve that problem by carefully shaving down one end of the 20 pin motherboard connector. Or sometimes the end of the 20 pin motherboard connector is too thick to fit between the pins of the 24 pin cable. The only problem you can bump into (literally) is if there is something blocking the spot where the 24 pin cable hangs over the end. But it's okay to leave those 4 pins disconnected because a motherboard with a 20 pin connector doesn't need them. The extra 4 pins were added to the 24 pin version of the cable to provide one extra wire for ground, 3.3, 5, and 12 volts. The 24 pin cable only fits into a 20 pin socket at one end so you can't plug it in incorrectly. The extra 4 pins on the cable just hang over the end of the motherboard connector. ![]() You can see an example in the picture above. If you have an ATX power supply with a 24 pin main cable, it's okay to plug it into a motherboard with a 20 pin connector. Unofficial cable/connector maximum wattage delivery for main rails Most newer power supplies don't provide -5 volts in which case the white wire is missing. Newer motherboards virtually never require -5 volts but many older motherboards do. ![]() The -5 volt line on pin 20 was made optional in ATX12V 1.3 (introduced in 2003) because -5 had been rarely used for years. These are pretty common on the 3.3 volt line in pin 13 but are sometimes used for other voltages too. Some of the voltage lines on the connector may have smaller sense wires which allow the power supply to sense what voltage is actually seen by the motherboard. The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction. The extra pins made the auxiliary power cable unnecessary so most ATX12V 2.x power supplies don't have them. The new 24 pin connector added one line apiece for ground, 3.3, 5, and 12 volts. The older 20 pin main power cable only has one 12 volt line. The 24 pin main power connector was added in ATX12V 2.0 to provide extra power needed by PCI Express slots. The AC cable for this is included and works with 100-240VAC inputs via a 2-prong style plug.Standard 4.2mm Pitch ATX Header Connector Datasheet Please refer to the picture of the bottom of the unit for more information. The pin next to 12V is not connected (NC). The ATX power connector breakout does not come pre-assembled. Note: Since this product is a kit, assembly and a basic knowledge of soldering will be required. If you want to easily grab some juice for your project from this connector, you'll need to connect the breakout board to this port. Depending on the manufacturer of the power supply, the quantity of each connector can vary. One of these connectors is the 4-pin power connector, which is intended to power 12V and 5V computer peripherals (such as disk drives). Do you need to power a project with 12V and 5V from one power supply? The ATX power connector breaks out the standard 4-pin computer peripheral port for your 12V and 5V devices! Once you have chosen a power supply (whether it be an ATX power supply or the included 12V/5V wall adapter), you're ready to give your project some life! This kit has everything you need to solder together an ATX breakout and screw terminals for powering your project directly or pumping power into a breadboard.ĪTX power supplies usually have a number of power connectors available to power components for a desktop computer.
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