CPU extension cable lengthens the connection between an existing power supply and the P4 connection on a motherboardUsed when there is a 8 pin CPU power connector on new motherboard, but the old power supply just has a 4 pin connectorCABLE MANAGEMENT SOLUTION for connecting an older power supply to a new motherboard in a bottom mount computercase Connector A: 1 X ATX 12V P4 4 pin female, connector B: 1 X ATX 12V 8 pin male