Cable Matters (2-Pack) PWM 2-Fan Splitter Cable - 4 Inches PWM FAN SPLITTER Y-CABLE connects 2 computer case fans to a single motherboard fan header; 1 to 2 fan converter cable connects an additional fan to increase airflow in your computer case MOBO 4-Pin receptacle connects to the 4-Pin header on the motherboard and splits the signal to 2 PWM fans; Fans can spin at the same speed using software from a motherboard equipped with PWM control MASTER/SLAVE FAN PLUGS have a 4 pin fan connector a wire that sends the RPM signal to the motherboard connector for synchronizing the fan speed with the other fan; 3 pin fan connector omits the RPM signal pin for tandem fan speeds with both fans DOUBLE FAN COVERAGE to add 4 fans with the cost-effective 2-PACK of PWM fan cables; Sleeved and wrapped black 4-inch case fan splitter cable provides a tidy look in an open computer case 3-PIN & 4-PIN FAN COMPATIBLE with popular brands of computer case cooling fans Corsair Air Series AF120 80mm / Series AF140 High Airflow, Cooler Master Blade Master 80 / Master 92, Cooler Master Hyper 212 EVO 120mm, Cooler Master JetFlo 120mm, Cooler Master SickleFlow 120mm, Cooler Master MegaFlow 200mm, Noctua NF-F12, Thermaltake WATER 3.0 Dual 240 3-pin or 4-pin fan compatible Motherboard must be able to power 2 fans Master Fan: 4-pin Male Slave Fan: 3-pin Male Motherboard PWM: 4-pin Female Max Power Rating: 12W Cable Length: 4 Inches Connect 2 fans to a single Mobo plug Fan speed control must be supported by the motherboard to regulate fan speed 4pin or 3pin PWM case fan compatible 2nd fan will run at the same speed (slaved) as 4pin fan when supported by the motherboard Tangle-resistant cable sleeving 4-inch cable length