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This 4-Pin Molex to 3-Pin fan power adapter converts traditional IDE Molex ports to 3Pin fan connectors, offering direct power for case and CPU cooling fans. Features dual 12V and 5V output options to adjust fan speed and noise as needed. Made with durable insulation and reliable internal wiring, it ensures safe, steady power delivery for long-term daily use. Compact and easy to route inside the case, it is a practical solution for fan expansion, header shortage and PC DIY cooling upgrades.