I recieved a scythe fan (JyuNi Kaze 1200). The fan has a 3 pin connector and an additional 4 pin molex connector that can be used. I used this because I read that the fan wouldn't run on full speed. But on this 4 pin molex connector there is also an additional 3 pin connector. What is it for and where should it be connected? Do I need to connect it? The fan already runs ok.