This is the Land Grid Array (LGA) socket type (http://en.wikipedia.org/wiki/Land_grid_array http://en.wikipedia.org/wiki/Land_grid_array) where the pins are on

This is the Land Grid Array (LGA) socket type (http://en.wikipedia.org/wiki/Land_grid_array http://en.wikipedia.org/wiki/Land_grid_array) where the pins are on the socket and the pads are on the chip. This supplants the Zero Insertion Force (ZIF) sockets (http://en.wikipedia.org/wiki/ZIF_socket http://en.wikipedia.org/wiki/ZIF_socket), those being a reworking of the Pin Grid Array (PGA) packaging (http://en.wikipedia.org/wiki/Pin_Grid_Array http://en.wikipedia.org/wiki/Pin_Grid_Array) which was a higher density version of the Dual Inline Package (DIP) standard (http://en.wikipedia.org/wiki/Dual_in-line_package http://en.wikipedia.org/wiki/Dual_in-line_package) used for the 80286 and prior chips.