Main Power Connector
- The main power connector on a motherboard provides 3.3V,
5V, and 12V DC power to the motherboard and connected components.
- Older motherboards use a 20-pin connector, while newer ones use a 24-pin
connector.
- A 24-pin power supply connector can often be used with a 20-pin
motherboard by leaving the extra four pins unconnected.
- Modular power supplies allow removing extra pins for compatibility.
- The connector is keyed to ensure proper alignment and prevent incorrect insertion.
- A locking mechanism secures the connector in place, requiring a latch release for
removal.
Additional Power Connectors
- Some components, like graphics cards, require extra power beyond what the
motherboard provides.
- PCI Express (PCIe) power connectors come in 6-pin (75W) and
8-pin (150W) variants, supplying 12V DC power.
- Some 8-pin connectors are designed to split into a 6-pin
configuration for flexibility.
- Adapter cards, such as video cards, may have dedicated power connectors that must
be connected to the power supply.
Storage Connectors
- SATA interfaces provide data connectivity for storage drives and use an
L-shaped connector.
- eSATA (external SATA) connectors allow external drive connections and may be
integrated into the motherboard or an expansion card.
- M.2 connectors are small, modular interfaces for SSDs and other
high-speed storage devices.
- M.2 drives are installed by inserting them into the slot and securing them with a screw.
Pin Headers and Front Panel Connectors
- Pin headers are small electrical interfaces on the motherboard used for connecting
case components like power buttons, LEDs, USB
ports, and speakers.
- Common pin headers include:
- USB headers (USB 2.0, USB 3.0, USB-C)
- TPM (Trusted Platform Module) headers
- Front panel connectors (power button, reset button, HDD LED)
- Connectors are usually labeled on the motherboard for easy identification.