power connector (Molex Mini-fit Jr. 39-28-1203, former 5566-20A or 39-28-1243, former 5566-24A) In 20/24-pin configurations, the Mini-Fit Jr. connector may be used on ATX motherboards as the main power connector. The same style of connector, in single or paired 4-, 6-, or 8-pin configurations, may be used for additional CPU power and graphics card power. Power delivery to these devices has increased in successive generations of PC components, as their higher signal sophistication and speed requirements have raised their electrical demands. The Mini-Fit Jr. can also be found in other consumer and industrial electric devices, such as major appliances, with high circuit density and high current requirements. These connectors are polarized so that they usually cannot be inserted incorrectly. They lock into position using an integrated latch. Standard pinout: Power good goes high to indicate that voltages are stabilised and ready for use. Power on is internally driven high, and shorting this pin to ground will turn on the power supply. AT motherboard power connector (P8 & P9 connector, Molex 90331) Older, AT motherboards utilized two connectors, commonly referred to as "P8" and "P9" that were positioned directly next to each other. These supplied +5V, +12V, −5V, −12V, "power-good signal", and ground. The most notable difference from modern 20/24-pin ATX power connectors is that the AT power supply connector did not have a signal to turn on the power supply, and also did not supply separate, "always-on" +5V standby power. The power supply was instead turned on and off via a heavy mechanical switch which removed mains power. Modern, ATX supplies, by contrast, are capable of being switched on and off by the computer itself, and the power button is actually a signal that is received by the motherboard and in turn passed along to the power supply. This allows the motherboard to remove power upon shutdown (with the exception of the aforementioned 5V standby power, which is always on), and also to "wake up" the computer by events such as key presses, mouse clicks, "wake on lan" events, and scheduled alarm times. These "wakeup" features are often configurable via the BIOS/CMOS setup. Disk drive Disk drive connector (AMP Mate-n-Lok 1-480424-0 power connector) The desktop computer hard-drive connector is pictured here. It has four conductors, with the standard pinout as follows: Sometimes, especially in older computers, the colors differ. The pins are apart (center to center). The connector housing has