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Mounting a fan over rear of MB to cool underside of CPU


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Most likely this be of no consequence or not beneficial in any way. The CPU heat does not radiate in all directions and instead takes the easiest, most conductive path - through the metal plate on the cooler. That’s why it works. Heat transfer through the multiple fiberglass layers of the board is not typically an issue and reducing the surface temperature on the backside would have little benefit to the front side where most of the heat is generated. The individual modules on the front side of the board create heat when electricity passes through them, so fan action for direct cooling is far more effective on that side.
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