About this item 3 pin ATX fan to 4 pin Molex connector cable fan power adapter Connector 1: loop-through 4-pin Molex connector (with male and female connections) Connector 2: 2 x 3-pin Fan (Internal) Male Solve the problem of insufficient 3Pin interface ports on the PC motherboard. Note: The 3-pin fan connector is only 2 pins/wire (no tachometer pin/wire) and the fan will run at maximum speed. Dimensions: 7 x 4 x 0.4 inches