It's not zero effort sockets
zero insertion force sockets
zero insertion force sockets (see page 178 in A+ Guide to Managing and Maintaining Your PC) "PGA, SPGA, and LGA sockets are all square or nearly square. So that even force is applied when inserting the processor in the socket, all current processor sockets have a lever on the side of the socket. These sockets are called zero insertion force (ZIF) sockets, and this lever is used to lift the processor up and out of the socket. Push the lever down and the processor moves into its pin or land connectors with equal force over the entire housing."
p4 processor is used in socket pga478 motherboard.
The AMD Athlon originally used Slot A. Later Athlons used Socket A.
An AM2 Socket is a type of socket used by a Processor on a motherboard. These are AMD processors, as indicated by the "AM". When you buy a motherboard and processor you must make sure that they have the same socket and that your motherboard supports the processor you have chosen. For more info: http://en.wikipedia.org/wiki/Socket_AM2
CPU Socket Type LGA 1366. Hoped I Helped
By far, the most used AMD mobile socket is the 638-pin S1 socket.
Socket 478
The object moved by a lever is called the load or the resistance. It is the weight or item that the lever is used to lift or move.
Currently FCPGA988 is the most popular Intel mobile socket, the most used socket for AMD is the 638-pin S1 socket.
That would go on a socket-7 motherboard. Socket-7 is the same platform as what was used for the original Pentium processor. That was out around the time that Windows 95 and Windows 98 were popular.
zero force is used to place the microprocessor in the socket or there is no need to give any force for fitting a microprocessor