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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
![6in 3-pin Fan to 4-pin Power Adapter Cable | Internal PC Power Cables | Power Cords | Power Charging and Cable Management 6in 3-pin Fan to 4-pin Power Adapter Cable | Internal PC Power Cables | Power Cords | Power Charging and Cable Management](https://cdn2.webdamdb.com/1280_smN42Rihl41.jpg?1625706445)