fan connection options

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Feb 6, 2015
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I have a ASRock Z97 Anniversary LGA 1150 Intel Z97 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard and a Rosewill Gaming ATX Mid Tower Computer Case CHALLENGER-U3 Black
case with 3 fans. I connected the cpu fan to CPU_FAN1, the back fan to CPU_Fan2 and the top fan to PWR_FAN1. I assume these are correct, if not please let me know.

My question is: What I have left is a front fan with a 3 pin connector and a chassis fan connector on the motherboard with 4 pins. Should I get an adapter or just use the optional molex plug and connect to the power supply?

Thank you in advance for your help and knowledge.