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Black sleeved cable with 4-pin Molex and 3-pin fan connectors

Darkside

Darkside 4-PIN Molex + RPM to 3-PIN Fan Conversion Cable 30cm Jet Black Sleeved

SKU CH-1CB1-BJ8KP

Converts a 4-pin Molex power connector with RPM signal to a 3-pin fan header for motherboard or controller use, 30 cm sleeved length

  • Cable length1 ft (0.3 m)
  • Connect Molex devices to 3-pin headers for flexible cooling control
  • 30 cm jet-black sleeved cable keeps builds tidy and airflow clear
  • RPM wire included so fan speed reports to motherboard or controller
  • 12-inch length suits compact and mid-tower chassis layouts
  • Observe 36 W header limit to protect motherboard from overload

Adaptor for Molex device to 3-pin header

This 30 cm sleeved cable converts a four-pin Molex connector with RPM wire into a three-pin fan header connection. It lets builders power a Molex device from a motherboard or fan-controller header without cutting or splicing wires. The jet-black sleeve keeps the run tidy inside the case.

Steady power within header limits

The adaptor passes power continuously from the Molex source to the three-pin header, so the load is limited by the header's own rating rather than the cable itself. The supplier warns that a device drawing 36 W on a header would damage the motherboard, while lighter loads such as LED strips remain safe. Sustained operation therefore depends entirely on staying within the header's unspecified current ceiling.

Simple plug-in with one clear risk

Installation is a straight push-fit: Molex plug into the device, three-pin plug onto the header, with no tools or software required. The only common mistake is ignoring the power warning and connecting a high-draw pump or similar load that exceeds what the header can supply. Verifying the device wattage before plugging in avoids that failure.

How it compares

Measured against everything we stock in Internal PSU & Riser Cables, at today’s prices. Recalculated every night.

Price $2.99
Cheaper than about 97% of the 7,839 comparable items (median $14.99).

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Specifications

Size & build
Cable length1 ft (0.3 m)

Questions about this item

Does the 30 cm cable add any electrical resistance that could affect fan RPM readings?

The 30 cm length adds negligible resistance; the RPM wire passes through unchanged so the motherboard or controller sees the true fan speed.

What must my motherboard or fan controller provide for this adapter to work?

A standard 3-pin fan header rated for the attached device's current draw; the adapter simply bridges Molex power and the RPM signal to that header.

Can I keep using an older Molex-powered fan with this cable on a modern 3-pin header?

Yes, the 4-pin Molex plug with RPM wire connects the fan to the 3-pin header, but confirm the fan's power draw stays within the header's rating.

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