12V 4-Wire PWM Fan Speed Controller – Digital Temp Display
12V 4-Wire PWM Fan Speed Controller – Digital Temp Display
Gmarty 12V 4-Wire PWM Fan Temperature Control Speed Controller
Take full command of your PC chassis or server cooling system with this intelligent 4-wire PWM fan speed controller. Featuring a built-in digital display for real-time temperature and RPM monitoring, this compact controller automatically adjusts fan speed based on thermal readings — keeping your system cool and quiet without manual intervention.
Key Features
- Intelligent PWM Speed Control: Supports 4-wire PWM fans with precise speed regulation across a 1–100% PWM range (±0.5%), balancing cooling performance with low-noise operation.
- Digital Temperature & Speed Display: Built-in readout provides real-time monitoring of both temperature and fan RPM — clear, intuitive, and always visible.
- Low-Temperature Auto Shutdown: Automatically powers off the fan when temperatures drop below the set threshold (supports fans up to 3A), reducing unnecessary noise and energy consumption.
- Wide Compatibility: Compatible with all standard 4-wire PWM fans used in PC chassis, CPU coolers, and server cooling systems. Supports reverse chronological fans and fan speeds up to 10,000 RPM (theoretical maximum: 30,000 RPM).
- Compact & Easy to Install: Small footprint makes it ideal for integration into tight chassis spaces, with straightforward wiring and reliable connections.
Technical Specifications
- Design Supply Voltage: DC 12V
- Operating Voltage Range: DC 8–16V
- Circuit Self-Consumption: <40mA (at 12V)
- Maximum Fan Current: 3.5A
- PWM Range: 1–100 (±0.5%)
- PWM Frequency: 25 kHz (±1 kHz)
- PWM Signal Amplitude: 5V (no load)
- Temperature Measurement Range: -9.9°C to 99.9°C
- Temperature Accuracy: <1.2°C error (0–50°C range); <2°C error (full range)
- Materials: Plastic & Metal
- Package Contents: 1 × Fan Speed Controller Set
Important Note: This controller is designed exclusively for 4-wire PWM fans using a 25 kHz / 5V signal standard. It does NOT support 2-wire or 3-wire fans. Please confirm your fan type before purchasing.
Made in Mainland China.
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Frequently Asked Questions
Q: Will this PWM fan controller work with my 3-wire chassis fan?
A: No — this controller is designed specifically for 4-wire PWM fans only. It uses a 25 kHz / 5V PWM signal standard and cannot regulate the speed of 2-wire or 3-wire fans. Please verify your fan connector type before purchasing.
Q: What is the maximum fan current this controller can handle?
A: The controller supports fans with a current draw of up to 3.5A. The low-temperature auto-shutdown function works with fans rated at 3A or below. Always check your fan's rated current before connecting.
Q: Can I use this controller outside of a standard PC chassis?
A: Yes. The wide operating voltage range (DC 8–16V) and compact design make it suitable for any cooling system that uses a 4-wire PWM fan — including servers, industrial equipment, custom PC builds, and other compact electronics requiring active thermal management.
Q: How accurate is the temperature reading on the digital display?
A: Within the 0–50°C range, the temperature measurement error is less than 1.2°C. Across the full measurement range (-9.9°C to 99.9°C), the error is less than 2°C, making it reliable for real-time system monitoring.
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.