A-2 Dell Dimension XPS Txxx and Txxxr Systems Reference and Troubleshooting Guide%& 'Bus types . . . . . . . . . . . . . . . . . . . . . . . . . PCI (version 2.1), ISA, and AGP(version 1.0)Bus speed . . . . . . . . . . . . . . . . . . . . . . . . . AGP: 66 or 133 MHzPCI: 33 MHzISA: 8.33 MHzAGP expansion-card connectors . . . . . . . . oneAGP expansion-card connector size . . . . . 124 pinsAGP expansion-card connector datawidth (maximum) . . . . . . . . . . . . . . . . . . . 32 bitsPCI expansion-card connectors. . . . . . . . . fourShared PCI/ISA expansion-cardconnector . . . . . . . . . . . . . . . . . . . . . . . . . onePCI expansion-card connector size . . . . . . 120 pinsPCI expansion-card connector datawidth (maximum) . . . . . . . . . . . . . . . . . . . 32 bitsISA expansion-card connectors . . . . . . . . . one (shares a card-slot opening with a PCIconnector)ISA expansion-card connector size . . . . . . 98 pinsISA expansion-card connector datawidth (maximum) . . . . . . . . . . . . . . . . . . . 16 bits System clock . . . . . . . . . . . . . . . . . . . . . . . 100 MHz (matches external processorspeed)Diskette/communications ports . . . . . . . . 48 MHz from the system clock#Architecture . . . . . . . . . . . . . . . . . . . . . . . . ECC or non-ECC SDRAM modulesDIMM sockets. . . . . . . . . . . . . . . . . . . . . . three; gold contactsDIMM capacities . . . . . . . . . . . . . . . . . . . . 32, 64, 128, and 256 MBMinimum RAM . . . . . . . . . . . . . . . . . . . . . 64 MB (non-ECC)Maximum RAM. . . . . . . . . . . . . . . . . . . . . 768 MBFrequency . . . . . . . . . . . . . . . . . . . . . . . . . 100 MHzClock cycle . . . . . . . . . . . . . . . . . . . . . . . . 10 ns (supports 4 clocks only)'(9 ))()*) NOTE: The Glossary in the system Help defines abbreviations and acronyms.