simply put can you run a 4 pin single led like this ( http://www.xs-pc.com/lighting/single-5mm-rgb-led-4pin-wire ) off a 3 pin male connector in my case in the phantex evlove x case
No idea what your question is.
3 pin is for addressable RGB strips(strip = multiple LED addressable = you can change color of each LED separately) i think you should find a 4 pin connector
not without another controller, the 3 pin is digital, the 4 pin is not.
you should also refer to your motherboard manual.
it is difficult to find 4pins nowadays