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Dell® OptiPlex® GX1 and GX1p mini tower Managed PC systems are high-speed, expandable personal computers designed around the Intel® Pentium® II microproces- sor. Each computer system uses a high-performance Peripheral Component Interconnect (PCI) design that allows you to configure the computer system to your initial requirements and then add Dell-supported upgrades as necessary. These sys- tems also support the Industry-Standard Architecture (ISA) bus for older expansion devices.

This chapter describes the major hardware and software features of your system, pro- vides information about accessing the online documentation, and tells you where to find help if you need it.

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Your system offers the following features:

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An Intel Pentium II microprocessor that runs at one of the following speeds:

—An internal speed of 266 or 333 megahertz (MHz) and an external speed of 66 MHz

—An internal speed of 350, 400, or 450 MHz and an external speed of 100 MHz

The Intel Pentium II microprocessor includes MMX™ technology designed to handle complex multimedia and communications software. This microprocessor incorporates new instructions and data types as well as a technique called single instruction, multiple data (SIMD) that allows the microprocessor to process multi- ple data elements in parallel, thereby improving overall system performance.

The Pentium II microprocessor has a 16-kilobyte (KB) internal data cache and a 16-KB internal instruction cache, an internal math coprocessor, and other advanced internal logic.

A keyboard command (<Ctrl><Alt><\>) that lets you switch between the micro- processor’s rated speed and a slower compatibility speed.

NOTE: This keyboard command is not available under the Microsoft® Windows NT ® and IBM ®OS/2®operating systems.

Introduction 1-1