EKWB EK-Cable Y-Splitter 2-Fan PWM, this is a simple 10cm black sleeved adapter used to hook up two PWM fans to one motherboard 4-pin PWM source or 3-pin DC FAN connector. Do not use high power fans with this adapter due to the possibility of overloading motherboard fan power regulator. The limit of a fan header on a typical motherboard is usually around 1A (12W). Please note RPM sensing will only work for one fan when using this cable. Fully sleeved cables (total length ~ 100mm.) RoHS compliant.