The form factor for Intel's Pentium Promicroprocessors. The Pentium Pro was the first microprocessor not to use the venerable Socket 7 form factor. The Pentium II microprocessors use an even newer form factor called Slot 1.
Socket 8 is a 387-pin ZIF socket with connections for the CPU and one or two SRAM dies for the Level 2 (L2) cache.
