CompTIA A+ 220-1201 (3.5 - Motherboard Connections)

24-pin motherboard power

• Main motherboard power

- Provides +3.3 V, +/-5 V, and +/- 12 V

• 20 pin connector was the original ATX standard

- 24 pin was added for PCI Express power

• You can connect a 24-pin connector

to a 20-pin motherboard

- Some cables are 20-pin + 4-pin

PCIe 6-pin and 8-pin power

• Additional power for PCI Express adapters

- 6-pin (75 watts), 8-pin (150 watts)

- Provides +12 V

• Commonly seen on high-power components

- Video adapters

• Some cables have two pieces

- 6 pin and 2 pin = 8 pin

- Use on both 6 pin and 8 pin connectors