Motherboard form factor designed for compact desktop systems.

Unbuffered desktop memory module.

Four-wire fan-control interface using pulse-width modulation.

Smaller derivative of the DTX motherboard standard.

Registered memory module used mainly in servers.

Power supply output providing approximately five volts.

Former motherboard form factor designed for improved cooling.

Load-reduced memory module for high-capacity systems.

Power supply output providing approximately twelve volts.

Older motherboard form factor used in some desktop systems.