If I understand you correctly you want to take a three pin fan connector the kind that attaches to the MB) and make it fit a four pin molex connector. This is a job for weasel techs. All you do is splice the red to red and the black to black and the white is usually ground. Make sure you pull the metal out of the plastic housing first and wrap the wire around the connector very well. This also works well for those annoying cpu fans that want to plug in the board, that your board doesn't support. And last but not least, you can repair all those old power supplies with the burnt-out fan in a similar fashion. Nothing broken --Everything is fixable. -AAAunderground