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"OKGEAR 3pin Power to 4pin molex Adapter"

OKGEAR 3pin Power to 4pin molex Adapter

Easy to use: Simply plug the adapter into your 3-pin power source and connect your fan to the 4-pin molex connector.

1 comment of this product found across Reddit:

1 point

1970-01-19 07:20:52.335 +0000 UTC

That connector is for taking a 3 pin fan and powering it with a power supply. 3 pin fans are normally powered by the motherboard.

You won't get an RPM reading from a Molex fan.