Socket PAC418 is a 418 pin microprocessor

Microprocessor

A microprocessor incorporates the functions of a computer's central processing unit on a single integrated circuit, or at most a few integrated circuits. It is a multipurpose, programmable device that accepts digital data as input, processes it according to instructions stored in its memory, and...

 socket designed to interface an Intel Itanium

Itanium

Itanium is a family of 64-bit Intel microprocessors that implement the Intel Itanium architecture . Intel markets the processors for enterprise servers and high-performance computing systems...

processor to the rest of the computer (usually via the motherboard). It provides both an electrical interface as well as physical support. This socket is designed to support a microprocessor module.

Technical specifications

Socket PAC418 was introduced with Intel's first generation Itanium in 2001. It supported bus speeds up to 133 MHz double-pumped.

Socket PAC418 processors reach speeds of 800 MHz.