Staggered Pin Grid Array (SPGA)
Definition - What does Staggered Pin Grid Array (SPGA) mean?
SPGA is generally used on motherboards for processors based on the Socket 5, Socket 7 and Socket 8 platforms.
Techopedia explains Staggered Pin Grid Array (SPGA)
The initial integrated circuits had pins arranged using the PGA, which sets pins in a grid-like structure. The advancement in processor design and the demand for more pins made the PGA inappropriate and outdated. The key objective of SPGA was to reduce the size of the microprocessor when more pins are required. The SPGA structure is used by processors centered on Socket 5, Socket 7 and Socket 8 technology.
The advantage of using an SPGA formation as opposed to the earlier versions is that it consists of closer pins, thereby allowing more pins for a specific surface area. This allows for the decrease in the microchip size or, in other words, offers better transfer capacity in a similar-sized chip.