<Li> 4 - pin Peripheral power connectors: These are the other, smaller connectors that go to the various disk drives of the computer . Most of them have four wires: two black, one red, and one yellow . Unlike the US standard mains electrical wire color - coding, each black wire is a ground, the red wire is + 5 V, and the yellow wire is + 12 V. In some cases these are also used to provide additional power to PCI cards such as FireWire 800 cards . </Li> <Li> 4 - pin Molex (Japan) Ltd power connectors (usually called Mini-connector, mini-Molex, or Berg connector): This is one of the smallest connectors that supplies a 3.5 - inch floppy drive with power . In some cases, it can be used as an auxiliary connector for Accelerated Graphics Port (AGP) video cards . Its cable configuration is similar to the Peripheral connector . </Li> <Li> Auxiliary power connectors: There are several types of auxiliary connectors designed to provide additional power if it is needed . </Li> <Li> Serial ATA power connectors: a 15 - pin connector for components which use SATA power plugs . This connector supplies power at three different voltages: + 3.3, + 5, and + 12 V . </Li>

What is difference between at and atx power supplies