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This 8-channel fan speed controller features 4 independent control knobs to separately adjust fan speed in groups. It supports all 12V PWM cooling fans for CPU, case, hard drive and VGA graphics card. Adopts PCI bracket installation for easy mounting on desktop motherboard PCI slot. Powered by SATA interface for stable and safe power input. You can freely adjust fan speed to strengthen heat dissipation or reduce running noise according to usage needs, perfect for PC DIY assembly and chassis cooling system management.