It is impossible to give you an estimate just check newegg for example to find your fans spec. All you need to do to power your fans is to put a paper clip in the green and black colored wire on the connector that goes onto the motherboard.
roundabout41 Reviewed by roundabout41 on . Comp case fan CFM Does anyone know what CFM these typically flow? Or can estimate? Also, how do you power (red, black, yellow 3-pin connector) them without having to use a motherboard and power supply? Rating: 5