[ CABLE / ADAPTER RECORD // ATX12V CPU AUXILIARY POWER ]
ATX12V 4-pin P4 CPU Power Cable
Keyed 2×2 plug: two +12 V contacts and two COM returns; motherboard-end wiring follows ATX12V assignment.
CLASSIFICATION: Internal power cables. Identify protocol, direction, pinout and exact cable revision before connection.
Interface and capability
| Standard / protocol | ATX12V CPU auxiliary power. Connector appearance alone does not establish compatibility. |
|---|---|
| Endpoint / pinout | Keyed 2×2 plug: two +12 V contacts and two COM returns; motherboard-end wiring follows ATX12V assignment. |
| Capability / limits | Power only; current limit depends on PSU harness wire gauge, contact rating and board load, not a data rate or universal length. |
| Certification / length | Standards define interface requirements, not every assembly’s performance. Certification, mode, current/power rating, direction and maximum length belong to the exact product/revision and complete channel; verify its manufacturer specification. Do not infer certification from connector shape or marketing terminology. |
Compatibility & handling
- Use only on a board’s ATX12V/P4 input. Never substitute PCIe 6+2 or infer modular-PSU pinout from the standardized motherboard end.
- Inspect connector keying, latch, contact condition, shielding, jacket and model/revision marking. Stop if contacts are bent, loose, scorched, corroded or mismatched.
- Route without tension or sharp bends; follow product bend-radius, strain-relief, current and environmental limits. Test at the intended protocol and mode—physical fit is not a compatibility test.
Sources & further reading
- ATX12V Power Supply Design Guide v2.2 (archived document)Archived copy of the Intel-origin ATX12V design guide; verify exact cable and PSU compatibility with current manufacturer documentation.