I have purchased a Corsair 600T. I bought this because I wanted to upgrade or enhance my prior desktop. But I came across with some sort of difficulty with the system fan to my motherboard. I would also like to tell you that there is single 4 pin SYS_FAN header on the motherboard only also I have only 3 cables to connect it. My question is that do I need some additional features to it also let me know whether I am making some mistakes in wiring or not? Where the 4 2 pin BLK twin wires should I connect?