The 24-pin ATX connector delivers the primary electrical currents from the Power Supply Unit (PSU) directly to the computer’s motherboard logic chips, PCIe slots, and system RAM. When building premium Intel Core Ultra custom workstations, our assembly engineers audit these pin lines to ensure flawless voltage stability. [1, 2, 3]
- Pin 1: 🔴 +3.3V DC (Orange)
- Pin 2: 🔴 +3.3V DC (Orange)
- Pin 3: ⚫ Ground (Black)
- Pin 4: 🔴 +5V DC (Red)
- Pin 5: ⚫ Ground (Black)
- Pin 6: 🔴 +5V DC (Red)
- Pin 7: ⚫ Ground (Black)
- Pin 8: ⚪ Power Good (Gray) | Signals CPU that voltages are stable
- Pin 9: 🟣 +5V Standby (Purple) | Powers system clock and USB wake states
- Pin 10: 💛 +12V DC (Yellow)
- Pin 11: 💛 +12V DC (Yellow)
- Pin 12: 🔴 +3.3V DC (Orange)
- Pin 13: 🔴 +3.3V DC (Orange) [With Sense wire]
- Pin 14: 🔵 -12V DC (Blue)
- Pin 15: ⚫ Ground (Black)
- Pin 16: 🟢 PS-ON (Green) | Turned to Ground by motherboard to turn on PSU
- Pin 17: ⚫ Ground (Black)
- Pin 18: ⚫ Ground (Black)
- Pin 19: ⚫ Ground (Black)
- Pin 20: ❌ Reserved / No Connection (Historically -5V White)
- Pin 21: 🔴 +5V DC (Red)
- Pin 22: 🔴 +5V DC (Red)
- Pin 23: ⚫ Ground (Black)
- Pin 24: ⚫ Ground (Black) [1, 2, 3, 4, 5]