Dell OptiPlex GX400 - Manual (Page 18)

While pressing the front-panel release button, rotate the top of the panel outward, away from the chassis. Lift the panel away from the chassis.
To replace the front panel, fit the two front-panel retaining hooks into the recessed slots at the bottom of the chassis (see " Removing the Front Panel "). Then
rotate the top of the panel toward the chassis until the front-panel latches snap into the tabs on the front panel.
System Memory
Your computer supports Rambus dynamic random-access memory (RDRAM) Rambus in-line memory modules (RIMMs) in 64-, 128-, 256-, and 512-megabyte
(MB) capacities (see "
Sample Memory Module Configurations "). " System Board Components " in "About Your Computer" shows the location of the four RIMM
sockets on the system board. Sockets that do not contain a RIMM must contain Rambus continuity RIMMs (CRIMMs).
RIMM Label Showing Number of Memory Devices
NOTICE: Before you install new memory modules, download the most recent BIOS for your computer from the Dell Support website at
support.dell.com.
NOTE: To reach the maximum 2-gigabyte (GB) memory total, you must install four 512-MB RIMMs that each have a maximum of 16 memory devices. The
system supports no more than a total of 64 memory devices on all installed RIMMs. See " RIMM Label Showing Number of Memory Devices " for the
location of the label on the RIMM that identifies the number of memory devices it contains. You can also determine the number of memory devices
installed through the System Memory option in
system setup .
NOTE: The system does not support RIMMs with six memory devices.
NOTE: All four RIMM slots must be occupied either by a RIMM or a CRIMM and must be upgraded in matched pairs of identical capacity in slots 1 and 2 or
slots 3 and 4. Mixed RIMM pairs provide a capacity equal to the sum of the four RIMMs; mixed pairs of RIMMs that provide error checking and correction
(ECC) and non-ECC will all function as non-ECC.
NOTICE: Be sure to install a RIMM in socket 1 first (closest to the processor) before installing a RIMM in socket 2.
Sample Memory Module Configurations
Total Memory Socket 1 Socket 2 Socket 3 Socket 4
128 MB 64 MB 64 MB CRIMM CRIMM
256 MB 64 MB 64 MB 64 MB 64 MB
256 MB 128 MB 128 MB CRIMM CRIMM
512 MB* 128 MB 128 MB 128 MB 128 MB
512 MB* 256 MB 256 MB CRIMM CRIMM
1024 MB 256 MB 256 MB 256 MB 256 MB
*512-MB RIMM technology will be supported when it is available.