Socket PAC611 is a 611 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 2

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 PAC611 was introduced with Intel's second generation Itanium in 2002. It supported bus speeds up to 200 MHz double-pumped.

Socket PAC418 processors reach speeds in excess of 800 MHz.