Hi
Not sure if it has a molex adaptor or a 3 pin motherboard adaptor ,your best bet is to click on the ask an owner button and pose the same question to somebody who has bought this fan.
yes you can plug in either one of them BUT only 1 at a time never use both at the same time.
EDIT: the 3 pin is not a Molex connector. It is a 3 pin Fan plug, that plugs into a Fan Header on the motherboard. the Big 4 Pin is what they call a Molex connector.