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This 8-channel fan speed controller comes with a manual adjustment knob and adopts PCI bracket installation design. It supports 12V PWM fans for CPU, chassis, HDD and graphics card, enabling centralized control of up to 8 fans. Powered by SATA interface for stable and continuous power input. The rotary knob allows free stepless speed regulation to lower fan noise or enhance heat dissipation as needed. Compact structure fits standard PCI slot perfectly, simple to install and suitable for DIY desktop assembly and daily PC cooling noise reduction.