Review on 4 Pin / 3 Pin PWM Fan Splitter Cable 2 Way Sleeved Braided Extension Power Cable 1 to 2 Converter for PC Motherboard, Desktop Computer CPU Fan - Pack of 3, 10.6 inches by Jim Velasco

Used these splitters to power 6 fans on a Phanteks P400A fan controller. The case originally only allowed 3 case fans per fan controller, but these splitters allowed 6 fans to be used without issue. Used on each fan control connector. In any case, all fans only used the first 2 pins, so the third of the fourth pins was not used at all. They don't have to. I wish the case would explain something like this, but fan splitters made it possible.