So i just added another RGB fan pack to my case for a total of 9 fans overall.
3 x 140 for the case
6 x 120 for the radiator.
I used to have all the fans connected to the CPU fan headers but now the case fans are connected to the sysfan2 header which is PWM but for some reason leaves the fans black on wake every time.
I swapped out the controllers and did try to use a splitter only for frightening results. My case has a PWM splitter that splits one pwm connection into several three pin connections though this would often leave one set of fan's without power after a short time.
Mother board is an MSI z97 Gaming 5, splitter I tried was the included Phanteks splitter for the Luxe Tempered glass (will hunt down better link)