Compaq W4000 manual Intel Pentium 4 Processor, Processor Assembly And Mounting

Chapter 2 System Overview

2.4.1 INTEL PENTIUM 4 PROCESSOR

The models covered in this guide feature the Intel Pentium 4 processor. This processor is backward-compatible with software written for the Pentium III, Pentium II, Pentium MMX, Pentium Pro, Pentium, and x86 microprocessors. The processor architecture includes a floating- point unit, 32-KB first and 512-KB secondary caches, and enhanced performance for multimedia applications through the use of multimedia extension (MMX) instructions. Also included are streaming SIMD extensions (SSE and SSE2) for enhancing 3D graphics and speech processing performance. The Pentium 4 processor features Net-Burst Architecture that uses hyper-pipelined technology and a rapid-execution engine that runs at twice the processor's core speed.

These systems employ an mPGA478B zero-insertion-force (ZIF) socket designed for mounting a “Flip-Chip” (FC-PGA2) processor package (Figure 2-10). Small form factor units use a passive heat sink held in place over the FC-PGA package with two retaining clips. Desktop and configurable minitower units use an active assembly (which integrates the heat sink and fan) that clips on to the processor socket over the FC-PGA package.

Heat Sink

Retaining Clips

Heat Sink for

Small Form Factor Units

Lock/Unlock Handle (Shown in unlock position)

Figure 2–10.Processor Assembly And Mounting

Heat Sink / Fan Assembly for Desktop and Configurable Minitower Units

FC-PGA2 Package

(w/ Integrated Heat

Spreader)

mPGA478B Socket

These systems support processors fitted with passive heat sinks or processors fitted with heat sink/fan assembly with a power cable that attaches to a fan-power header provided on the system board. There are three types of passive heat sinks.

NOTE: The two types of heat sinks are not interchangeable. Also, these systems support processors using the FC-PGA2 package only.

2-14Compaq Evo and Workstation Personal Computers

Featuring the Intel Pentium 4 Processor

Second Edition – January 2003