The 3.3V has been used exclusively to power PCI slots - while on-board internal regulator usually makes 3.3V for chipset and CPU, it may be too weak for some PCI boards so in early mainboards it is not routed to slots. Intel Advanced/AS mainboard), the pinout stays the same as shown in the document. KK 254 Solid Header, Vertical, with Friction Lock, 2 Circuits, Tin (Sn) Plating Molex Connector Wire to Board Header 2 Position 2. Descriptions Descriptions of Molex 22-23-2021 provided by its distributors. Atlantis Socket 5 and similar Socket 7 mainboards). Download datasheets and manufacturer documentation for Molex 22-23-2021. The power connector itself is a Molex 8981 connector called the AMP MATE-N-LOK. P10 AT aux power supply connector (found on some Dell socket 5, 7 and 8 motherboards). The proprietary 3.3V connector is not only for Dell, but also IBM (especially Power Series) and Intel (e.g. Pinout for the standard 4-Pin Molex peripheral power connector By Tim Fisher Updated on AugThe Molex 4-pin power supply connector is one of the standard peripheral power connectors in computers today.

The two negative rails are bias supplies which only have to provide small amounts of current. MLX 2.13MM (. If youre using this pinout table to test power supply voltages, be aware that the voltages must be within ATX specified tolerances. That was used primarily to run disk drives, motors, and fans. ATX 24-Pin 12V Power Connector Pinout (ATX v2.2) Below is the complete pinout table for the standard ATX 24-pin 12V power supply connector as of Version 2.2 of the ATX Specification (PDF). There are three or four lines dedicated to the 5 volt rail. As a result the PSU delivers most of its wattage at 5 volts.

In old PCs, almost all of the chips ran directly off of the 5 volt rail.

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