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b450 tomahawk pump fan vs sys fan?

Hi, im using the b450 tomahawk mobo and i noticed it has both pump fan vs sys fan connection pins on it, at the moment I'm trying to connect the front fan from the corsair 275r (3 pin slot connector), which should I connect the fan to as both are 4 pin connection points, so 1 pin would be left exposed regardless of whichever one I connected to.

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