DC12V 4P PWM Fan Speed Controller with Knob (Model B) Take direct control of your PC cooling with this compact DC12V 4pin (4P) PWM fan speed controller. Designed for straightforward, manual adjustment, the knobstyle control lets you balance cooling performance and acoustic comfort so your system runs quieter when full fan speed isn't required and ramps up cooling when it is. Key benefits Precise manual control: The knobstyle control switch provides smooth, immediate adjustment of 4pin PWM fan speed for onthefly tuning. Lower noise, effective cooling: Run fans at the lowest effective speed for daily tasks to reduce noise, and increase speed for demanding workloads to improve heat dissipation. Easy compatibility: Built for standard DC12V 4pin PWM CPU and case fans used in desktop PCs and small systems. Compact and unobtrusive: Small footprint for flexible mounting inside a chassis or on a fan bracket without interfering with components. Features and attributes Functionality: Manual PWM speed control for 4pin DC12V fans via a knobstyle control switch. Adjusts fan PWM signal to vary rotational speed. Compatibility: Compatible with standard 4pin (PWM) DC12V CPU and chassis fans. Intended for desktop PC and similar applications that use 4pin PWM fan connectors. Size and installation: Compact housing designed for easy placement in PC cases. Simple plugin connection to a 4pin fan header on the controller. Construction and performance: Built with standard electronic components to deliver stable PWM control. Model: B. Optimizes the tradeoff between acoustic noise and cooling performance. Purpose: Noise reduction during light use and improved heat dissipation during heavy use by allowing manual speed adjustments. How it solves problems Reduces distracting fan noise during everyday use by letting you dial down unnecessary fan speed without disabling cooling entirely. Prevents thermal buildup during intensive tasks by allowing quick increases to fan speed for better heat removal. Removes the need to change BIOS settings or software fan curves for quick, manual control. Typical use cases Home or office desktop: Lower fan speeds for quiet operation while browsing, streaming, or working, then increase speed for long renders or heavy multitasking. Gaming or performance PC: Quickly adapt fan speed during gaming sessions to keep temperatures in check and reduce noise during idle or lightload periods. Small server/NAS or media center: Manage acoustics and temperatures in constrained spaces where fixed fan profiles are too aggressive or too quiet. Quick setup guide Plug your 4pin PWM fan connector into the controller's 4pin socket. Mount the controller in a convenient location inside the chassis or on a fan bracket. Turn the knob to the desired speed setting; lower for quieter operation, higher for maximum cooling. What's included DC12V 4P PWM Fan Speed Controller with Knob (Model B). Compatibility note Designed for DC12V 4pin PWM fans. Verify your fan uses a 4pin PWM connector before use. This controller provides a simple, reliable way to finetune fan behavior for quieter operation and controlled cooling, without changing software or BIOS settings. Model B offers a direct, manual approach to balance noise and thermal performance in systems that use standard 4pin PWM fans.