Hi, I need some advice please, I have an Gamemax Iceberg240mm Water cooler and an MSI A88X G45 mobo, both should be compatible, but I am confused as to how to connect as the lead from the CPU cooler has a 3 PIn connector and my Motherboard has a 4 Pin CPU Fan header. This may be an easy fix, I hope, but I am new to this.
You can connect a 3pin cable to the 4pin header on the motherboard. It will leave one of the pins unused of course. The extra pin is for PWM fans, but as you are connecting your pump, you don't need it.