Ok, so instead of connecting to the rgb controller i put 1 to 3 rgb splitter to the RGB LED strip header and keep the controller aside? and what is the use of this system fan header, what to connect with that?
Your fans should have two cables. Look at the manual and see which one is for RGB and the actual fan. Plug the fan into your board in the system fan header and plug the rgb plug into the spliier. Then plug the spliter into your mobo.