Although physically similar, the Socket 479 has a different electrical pin-arrangement from Socket 478, making it impossible to use a Pentium M processor in a normal 478 board even though it fits in a Socket 478.
Socket P has 478 pins, but is not electrically pin-compatible with Socket M or Socket 478.
CPU socket | Socket 370 | Socket M | Socket 478 | Secure Socket Tunneling Protocol | United Nations Security Council Resolution 478 | tube socket | Socket P | Socket G34 | Socket FM1 | Socket AM2 | Socket 604 | Socket 479 | Socket 3 | Socket 2 |