USB 5V to 12V 4-Pin PWM Fan Power Adapter Cable + Speed Switch
USB 5V to 12V 4-Pin PWM Fan Power Adapter Cable + Speed Switch
Power Your PC Fan from Any USB Port — USB 5V to 12V 4-Pin Adapter Cable
This compact PWM boost converter cable lets you power a standard 4-pin PC chassis fan or CPU fan directly from a USB 5V source, stepping up the voltage to the 12V your fan requires. Whether you're building a custom cooling pad, modifying a case fan setup, or repurposing a fan for a DIY project, this adapter makes it effortless — no extra power supply needed.
Made in Mainland China.
Key Features
- 5V to 12V Boost Conversion: Converts USB 5V input to a stable 12V output to run standard 4-pin PC fans without a separate power brick.
- Built-in Speed Adjust Switch: Inline PWM speed control switch lets you dial up or dial down fan speed on the fly — no software required.
- Universal Compatibility: Works with most 4-pin PWM chassis fans and CPU fans. Perfect for DIY laptop cooling pads, case modding, or desktop fan setups.
- All-Copper Core Wire: Full copper conductor wire for efficient power delivery and minimal signal loss.
- PVC Insulation: Durable PVC outer jacket for long-lasting protection and flexibility.
- Compact & Convenient: Approximately 35 cm (13.8 in) in length with OD 3.5 mm wire — easy to route inside a case or cooling pad build.
Technical Specifications
- Input Voltage: 5V (USB)
- Output Voltage: 12V
- Maximum Power: 11W
- Cable Length: ~35 cm
- Wire Outer Diameter: OD 3.5 mm
- Insulation Material: PVC
- Connector: USB Type-A (input) → 4-Pin fan connector (output)
Who Is This For?
This cable is ideal for PC enthusiasts, modders, and makers who want to use a USB port to power a chassis or CPU fan. It's also a great solution for anyone building a custom laptop cooling pad who needs to adapt a standard 4-pin fan to a USB power source.
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Frequently Asked Questions
Q: What fans are compatible with this USB 5V to 12V 4-pin PWM adapter cable?
A: This adapter is compatible with most standard 4-pin PWM computer fans, including chassis fans and CPU cooling fans. It is ideal for any DIY or modding project that requires powering a 4-pin fan from a USB port.
Q: Does the speed adjust switch work with all fan types?
A: The inline speed adjust switch works with PWM-compatible 4-pin fans, allowing you to manually control fan speed without any additional software. Performance may vary with non-PWM 3-pin fans, so 4-pin PWM fans are recommended for best results.
Q: Can I use this cable to build a laptop cooling pad?
A: Yes! This cable is specifically useful for DIY laptop cooling pad builds where you want to repurpose a standard 4-pin PC chassis fan. Simply connect the USB end to any USB port and the 4-pin connector to your fan.
Q: What is the maximum power this adapter cable supports?
A: The cable supports a maximum output of 11 watts at 12V, which is sufficient for most single 4-pin PC fans used in case cooling or CPU fan applications.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.