Dell Dimension XPS 50 Reference Manual page 42

2-16 Dell Dimension XPS Txxx and Txxxr Systems Reference and Troubleshooting Guide
6. Replace the computer cover and support beam; reconnect your computer and
devices to their electrical outlets and turn them on.
Memory can be increased to a maximum of 768 megabytes (MB) by installing combi-
nations of 3.3-volt (V) 32-, 64-, 128-, and 256-MB dual in-line memory modules
(DIMMs) in the three DIMM sockets on the system board. Only 100-megahertz (MHz)
DIMMs are supported. Purchasing memory upgrades from Dell Spare Parts ensures
system compatibility; these upgrades are also covered under your system warranty.
NOTE: Your computer is designed for peak performance with specific DIMMs that are
validated through rigorous testing. The system may not recognize other synchronous
dynamic random-access memory (SDRAM) DIMMs and may fail power-on self-test
(POST).
Dell Dimension XPS Txxx and Txxxr systems can use SDRAM modules that provide
error checking and correction (ECC) capabilities. To support ECC, all installed DIMMs
must be ECC-capable.
NOTES: You can mix DIMM sizes and install them in any order in the memory banks,
leaving a bank unoccupied if necessary. Dell recommends but does not require that
you fill the sockets in order starting with Bank 0.
As the amount of system memory increases, especially with ECC-type memory
installed and enabled, the longer it takes for the video to synchronize with the system
during system start-up. For example, video may not appear for 30 seconds or more in
a system with 768 MB of ECC memory installed after the computer has been turned
on or restarted.
To install a DIMM, perform the following steps:
1. Remove the computer cover and support beam according to the instructions in
"Removing and Replacing the Computer Cover and Support Beam" found earlier
in this chapter.
2. Press outward on the plastic securing clips at each end of the DIMM socket to
release them as shown in step 1 of Figure 2-10.