[ CABLE / ADAPTER RECORD // ATX MAIN POWER CONNECTOR ]

ATX 24-pin Main Power Cable Extension

24-contact motherboard plug carries supply rails, grounds, control and sense signals per ATX guide.

CLASSIFICATION: Internal power cables. Identify protocol, direction, pinout and exact cable revision before connection.

Interface and capability

Standard / protocol	ATX main power connector. Connector appearance alone does not establish compatibility.
Endpoint / pinout	24-contact motherboard plug carries supply rails, grounds, control and sense signals per ATX guide.
Capability / limits	Power only. Extension rating and length depend on conductor gauge and connector certification; ATX pinout does not certify aftermarket extensions.
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.

Use correctly pinned straight-through extension. Modular PSU outputs are proprietary; never cross-connect PSU-side cable families.
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.

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.