Link Depot 3-Pin Female to 4-Pin Male PC Power Adapter (Discontinued by Manufacturer) It has copper conductors Additional connector for monitoring fan speed One connector with 3 male pins on the first side Power a 3-pin fan with a standard 4-pin PC power connector Two 4-pin Molex connectors on the second side (one female, one male) Power a 3-pin fan with a standard 4-pin PC power connector One connector with 3 male pins on the first side Two 4-pin Molex connectors on the second side (one female, one male) Additional connector for monitoring fan speed Copper conductors