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This SATA to 3Pin/4Pin PWM fan splitter hub is specially designed for desktop computer chassis cooling fans. It draws stable 12V power directly from motherboard SATA power port, easily expanding power ports for multiple case fans. Support both 3-pin and 4-pin PWM fans, suitable for daily PC assembly and fan upgrading. Small and lightweight with sturdy construction, effectively avoids loose connection and ensures safe & stable operation. Ideal for improving internal heat dissipation and optimizing internal cable management.