Users Guide

NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain Federal
Communications Commission (FCC) certification of the system. The brackets also keep dust and dirt out
of your computer.
7. Replace the computer cover, and reconnect your computer and peripherals to their power sources and turn them
on.
NOTE: After you remove and replace the cover, the chassis intrusion detector will cause the following
message to be displayed at the next system start-up:
ALERT! Cover was previously removed.
8. To reset the chassis intrusion detector, enter the System Setup program and reset Chassis Intrusion to Not
Detected.
See "Using the System Setup Program" in your User's Guide for instructions.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for
information on resetting the chassis intrusion detector.
Adding Memory
System memory consists of up to four dual in-line memory modules (DIMMs) installed in sockets on the system board
(see Figure 5, DIMMs and DIMM Sockets). The system can use either unbuffered or registered synchronous dynamic
random-access memory (SDRAM) modules that provide error checking and correction (ECC) capabilities.
By installing 64-, 128, and/or 256-MB DIMMs, you can increase system memory from its standard total of 64
megabytes (MB) up to the following memory totals:
512 MB, using unbuffered SDRAM DIMMs
1024 MB (1 gigabyte [GB]), using registered SDRAM DIMMs
Unbuffered and registered SDRAM DIMMs cannot be mixed in the system.
Figure 5. DIMMs and DIMM Sockets
DIMM Installation Guidelines
When adding system memory, you may install DIMMs in any order. For optimum operation, Dell recommends
installing the DIMMs starting with socket A (closest to the top edge of the system board) and working toward socket D,
leaving no open sockets between installed DIMMs.
Table 1, Sample Unbuffered SDRAM DIMM Configuration Options
, and Table 2, Sample Registered SDRAM