4 pin, PWM fans. If you get a 3 pin then you would have zero control over the fans. You might also need to get a fan splitter (PWM) if you want more than one case fan if your MB doesn't have enough system fan slots. You could get a 3 pin but you won't be able to control the speed (RPM) of the fans but you might be able to control the RGB if it comes with a remote control.Both. Ok so I would need the 3 pin or 4 pin one