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Stupid prebuilt had the Aio 3 pin plugged into "cpu fan" and the radiator fan plugged into "sys fan1" because the cord looks like it was too short to reach the "cpu
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What's the difference between 'CPU FAN' socket, 'CPU OPT' socket, and a 'SYS FAN' socket on motherboard? - Quora
What's the difference between 'CPU FAN' socket, 'CPU OPT' socket, and a 'SYS FAN' socket on motherboard? - Quora
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System FAN vs CPU FAN Headers - Difference & When to Use Which
What is the Difference Between System Fan and CPU Fan? - PC Guide 101