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Black USB cable with inline transformer block splitting to dual 4-pin fan connectors

Darkside

Darkside USB Mini-Transformer 12v Dual Fan Adapter Cable 50cm Black DS-1044

SKU CH-VK39-8WBNK

Converts USB power to 12 V for two fans via a single 4-pin connector on a 50 cm black cable

  • Cable length1.6 ft (0.49 m)
  • Powers 12 V fans from any USB port
  • Built-in step-up transformer raises voltage to 12 V
  • Single 4-pin header fits both 3-pin and 4-pin fans
  • 50 cm length suits compact internal routing
  • Jet Black sleeving protects wires and looks clean

USB 12 V fan adapter for compact builds

This Darkside cable converts a standard USB port into a 12 V supply for a single cooling fan. The integrated step-up transformer raises the bus voltage so a 12 V fan can run directly from a motherboard header, a power bank or any USB-A socket. It targets builders who need a low-profile cooling solution without a dedicated fan header or external power brick.

50 cm Jet Black sleeved lead with 4-pin fan plug

The half-metre cable ends in a 4-pin connector that accepts both 3-pin and 4-pin fans, while the Jet Black sleeving keeps the run tidy inside small cases. Current is limited by the USB specification: 0.5 A on a 2.0 port and 0.9 A on a 3.0 port, so the adapter only supports fans that stay within those limits.

Check USB port current rating

Verify that the host port can deliver enough amperage for the fan you intend to use; exceeding 0.5 A on USB 2.0 or 0.9 A on USB 3.0 will trigger protection or cause instability. The adapter provides a single fan connection only, so setups requiring multiple fans or higher-startup-current models need a different power source.

How it compares

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

Price $4.99
Cheaper than about 95% of the 7,839 comparable items (median $14.99).

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Specifications

Size & build
Cable length1.6 ft (0.49 m)

Questions about this item

Will the transformer or USB connector degrade if I run two fans continuously at the 0.9 A USB 3.0 limit?

The adapter has no user-serviceable parts; the transformer and USB plug are moulded into the cable, so nothing is designed to be replaced.

What stops me from drawing more than 0.9 A from a USB 3.0 port when both fans spin up?

The host port enforces its 0.9 A ceiling; if combined fan draw exceeds that, the port will throttle or shut down.

Does the transformer get hot or make noise when it up-volts to 12 V all day?

The unit is passive with no fan or moving parts, so it produces no audible noise; warmth will be low at the rated 0.9 A load.

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