V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

FCPGA
       Flip Chip Pin Grid Array (IC, CPU), "FC-PGA"


The Free On-line Dictionary of Computing (30 December 2018):

Flip Chip Pin Grid Array
FC-PGA

    (FC-PGA) The package of certain Intel
   Celeron and Pentium III processors.  FC-PGA processors fit
   into Socket 370 motherboard sockets.

   The Flip Chip Pin Grid Array is similar to PPGA, except
   that the silicon core is facing up and the heat slug is
   exposed.

   FC-PGA packaging is used by Pentium III processors, and
   Celeron 566 processors onward.  Earlier Celeron processors
   used PPGA packaging.

   Celeron processors are also available in Slot 1 SEPP
   packaging and Pentium III processors in Slot 1 SECC2
   packaging.

   Adapters are available to allow a PPGA Celeron to plug into
   a Slot 1 connector.

   (2000-08-26)