4pin is 12V, it has voltage on each pin and 1 pin for ground. It's normal RGB and is not addressable.
Motherboards can have different headers for each variant, if your motherboard doesn't have a 4 pin header your options are put a different type of RGB strip in the reservoir (if you can access it and find a suitably sized strip) or get an RGB box that plugs into power of some sort and has a button on to switch the RGB modes and doesn't allow any control from motherboard software.
The splitter should work fine as everything attached to it will get the same signals and be the same colour. With addressable RGB it's tricky as you'd then be sending the flishy flashy signals to two different places so any patterns / motion in the LEDs wouldn't sync up.So I bought a Coolermaster C01L and a splitter that will hopefully allow the C01L to connect to power and then control with buttons a Bykski block and the EK res together.
Must point out, this isn't true. The vast majority of 12V RGB has a common positive wire and you ground the next 3 wires to enable current on each colour. Pinout is usually labelled "12V G R B".4pin is 12V, it has voltage on each pin and 1 pin for ground. It's normal RGB and is not addressable.
Ok so that's in with the little controller gadget and the Bykski block attached the same.
Now what do I do about the Seahawk. How do I get some light onto it? Any suggestions?