I came across the F5 controller as it looked promising for controlling the 5 PWM fans I have (Cougar Vortex PWM), but although the controller states it can control 4-pin, PWM fans it only shows 2 (or 3) wires. How is that able to control PWM fans? Or, if it can, then wat's the point of the 4th wire? I readily admit I am new to PWM fans but it would seem that you would need a 4-pin controller for a 4-pin fan, otherwaise the 4th wire is extraneous. Any advice would be greatly appreciated! Thank you!