DarkSide 4-PIN Molex + RPM Wire to 3-PIN Fan Conversion Cable - 30cm Jet Black Sleeved (DS-0525) ModMyMods.com - PC Watercooling Parts and Accessories
Amazon.com: SDTC Tech Molex to Fan Power Splitter Cable, 2 Pack 4-Pin IDE to 3X 4-Pin Fan Connector Black Sleeved Y Type Extension Power Cable Compatible with 3-Pin/4-Pin PC Case Fans -