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are all 3 pin fans running at (5v) and all 4 pin fans running at (12v)? If so, why is a 3 pin fan able to connect to a 4 pin header
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4 Pin Molex Pass Through to 2 x / Dual 3 Pin Fan Power Connector Adapter Cable - International Society of Hypertension
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Amazon.com: PNGKNYOCN 3-Pin Fan to 4-Pin Molex Pass-Through Power Adapter Cable, 4-pin Molex/IDE to 3 Pin CPU Fan Power Cable(2-Pack) : Electronics
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