It was also used in the first generation of the mobile version of Intel's Core 2 Duo, specifically, the T5x00 and T7x00 Merom lines (referred to as Napa Refresh), though that line switched to Socket P (Santa Rosa) in 2007.
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 | tube socket | Socket P | Socket G34 | Socket FM1 | Socket AM2 | Socket 604 | Socket 479 | Socket 3 | Socket 2 |