support.dell.com Introduction 1-1 Dell™ Dimension™ XPS Txxx and Txxxr computer systems are high-speed personalcomputers that include an Intel® Pentium® III microprocessor. These systems com-bine high-performance Peripheral Component Interconnect (PCI) design withaccelerated graphics port (AGP) and Industry-Standard Architecture (ISA) design,allowing a wide range of initial configurations and upgrade possibilities.This chapter provides information about the following: Major hardware and software features of your computer Available upgrades for your computer Preventive maintenance procedures to protect your investment and extend thelife of your computer. ) * Your Dell computer offers the following hardware features: An Intel Pentium III microprocessor that runs at an external speed of 100 mega-hertz (MHz).The Intel Pentium III processor in your computer includes Streaming™ SingleInstruction, Multiple Data (SIMD) Extensions. This technology improves the per-formance of 3D graphics, 3D audio, and other advanced application programs,such as speech recognition software.The Main screen of the system setup program lists the speed of your system’sprocessor. For information on accessing this program, see Appendix B, “SystemSetup Program.” A dedicated graphics bus that significantly enhances 3D graphics performanceand supports up to 2X AGP based on the video card. Memory that can be increased up to 768 megabytes (MB) by installing 32-, 64-,128-, or 256-MB synchronous dynamic RAM (SDRAM) dual in-line memorymodules (DIMMs) in the three DIMM sockets on the system board.