FIELD GUIDESource-led reference

Printable reference · P11F06

Power look-alikes: stop and verify

A similar shell, contact count or apparent fit does not establish the power role, voltage, polarity, cable mapping or exact equipment support.

Letter PDF A4 PDF

Reference revision 2 · Assessed 2026-10-22. AI-assisted source reference; no independent review or hardware validation.

Which missing fact prevents a safe, supported cable or supply choice?

Keep the visible clue and its evidence limit separate
Clue or questionSupported distinctionSources
Barrel 2.1 / 2.5 mmOuter diameter, inner bore and exposed mating length are separate. A 5.5 mm outer size does not determine the bore or electrical requirements.S031 S484
EPS / PCIe eight-pinDocumented EPS 4+4 and PCIe 6+2 examples have different roles. A motherboard can also have a PCIe-power input.S474
Modular PSU cableMatch the exact PSU model/cable family and component instructions. The wrong modular cable type can damage hardware.S489
16-contact GPU powerGeneric twelve-power/four-sideband appearance does not establish header revision, cable rating or complete seating. Board-header and cable-housing roles differ.S280 S561
12 V RGB / 5 V ARGBThe documented MSI JRGB and JRAINBOW examples differ in voltage and pin form. A 5 V strip on a 12 V header can be damaged.S458

Check the complete task

  1. Read exact device, supply/PSU and cable identities. Retain manufacturer labels, model/revision and the supported connection class.
  2. For barrel power, obtain exact geometry and device/supply voltage, polarity and current requirements. Do not substitute overall body length for exposed mating length.
  3. For internal power, use exact board/GPU/PSU documentation and the maker cable-compatibility list. Keep qualified housing/header views and revision limits.

Text and conceptual comparisons only. No specimen photographs, contact-position diagrams, measured geometry or actual-size templates.

Keep an evidence note

Sources and exact scope

Inherited scoped research is reused; this sheet does not claim every source was freshly reopened. No manufacturer figures, manuals or logos are redistributed.

Continue with the exact reference