Might be a dumb question but Would anything happened if I unplug the fan from the sysfan port on my mother board and run the fan via the splitter on my h100iv2 and leave the sys fan unplugged?
Only need a fan or the signal cable from the h100 on the cpu fan. If something isn't there your system will alert you, it's a failsafe in case whatever is cooling your cpu fails. Anything else is up to you.