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Black adapter cable with 4-pin Molex plug and 3-pin fan socket

ModMyMods

ModMyMods MOD-0084 4-Pin Molex to 3-Pin Fan Adapter Cable

SKU CH-EW88-F7VSH

Connects a 3-pin fan to a 4-pin Molex power connector for motherboard fan headers

  • Product colorBlack
  • Key features4-Pin Molex Power Connector to 3-Pin Fan Connector
  • Connect a 4-pin Molex fan to a 3-pin motherboard header
  • Adaptor cable bridges Molex power and standard fan connectors
  • Black cable with dark blue accents for a clean look
  • Single adapter included for quick installation
  • Model MOD-0084 identified by part number 177

Purpose and Build

The ModMyMods MOD-0084 adapter cable connects a 4-pin Molex power connector to a 3-pin motherboard fan header. It is intended for PC builders who need to power a Molex-equipped fan from a standard fan header. The cable ships in black and dark blue and includes one adapter in the package.

Fit and Limits

This adapter suits systems where the fan uses a Molex plug and the board provides only a 3-pin header. It does not add PWM control, so the fan will run at full speed or voltage-controlled speed only. Builders who need 4-pin PWM signalling or a different connector orientation should look at other options.

Deciding Specification

The single specification that decides compatibility is the 4-pin Molex to 3-pin fan header conversion. If your fan has a Molex connector and your motherboard header is 3-pin, this cable matches that exact interface.

How it compares

Measured against everything we stock in USB & Parallel Printer Cables, at today’s prices. Recalculated every night.

Price $1.56
Cheaper than about 97% of the 127 comparable items (median $11.99).

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Specifications

Product
Brand nameModMyMods
Model nameMOD-0084
Product colorBlack

Questions about this item

How do I connect this adapter between a 4-pin Molex fan and a 3-pin motherboard header?

Plug the fan's 4-pin Molex connector into the adapter's matching socket, then insert the adapter's 3-pin end into the motherboard fan header, aligning the keyed tab.

Will the 3-pin connection limit fan speed control compared to a 4-pin PWM header?

Yes, the 3-pin interface provides voltage-based control only, so PWM signalling is not passed through to the fan.

What happens if the fan draws more current than the motherboard 3-pin header can supply?

The header's current limit will be reached first, potentially causing the fan to run slower or the header to shut down.

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