Dell Precision 420 - Manual (Page 12)

2. If you have a mini tower chassis, remove the AGP card brace according to the instructions in " Removing and Replacing the AGP Card Brace
(Mini Tower Chassis Only) ."
3. If necessary, disconnect any cables connected to the card.
4. Unscrew the mounting bracket of the card you want to remove.
5. Grasp the card by its outside corners, and ease it out of its connector.
6. If you are not replacing the card, install a metal filler bracket over the empty card-slot opening.
7. If you have a mini tower chassis, replace the AGP card brace.
8. Replace the computer cover, and reconnect your computer and peripherals to their electrical outlets and turn them on.
9. To reset the chassis intrusion detector, enter the System Setup program and reset Chassis Intrusion to Enabled or Enabled-Silent.
Adding Memory
Dell Precision 420 systems support dual direct Rambus dynamic random-access memory (RDRAM) channels. The channels are designated A
and B. Dell Precision 420 systems support Rambus in-line memory modules (RIMMs) in 64-, 128-, 256-, and 512-megabyte (MB) capacities. The
RIMMs feature error checking and correction (ECC).
Dell Precision 420 systems support a maximum of four RIMMs for up to 2 gigabytes (GB) of total memory.
Figure 6 shows the RIMMs and RIMM sockets.
Figure 6. RIMMs and RIMM Sockets
RIMM Installation Guidelines
When you add system memory, you must install RIMMs in matched pairs (pairs of identical capacity). If only one pair of RIMMs is installed, they
must occupy slots RIMMB_1 and RIMMA_2, and you must install continuity RIMMs (C-RIMMs) in sockets RIMMB_3 and RIMMA_4.
Tables 1 lists sample memory configurations.
Table 1. Sample RIMM Configuration Options
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.
NOTE: After you remove and replace the cover, the chassis intrusion detector causes the following message to be displayed at
the next system start-up:
ALERT! Cover was previously removed.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting
the chassis intrusion detector.
1 Socket RIMMB_1
2 Socket RIMMA_2
3 Socket RIMMB_3
4 Socket RIMMA_4
Total
Desired
Memory
RIMM Socket
RIMMB_1 RIMMA_2 RIMMB_3 RIMMA_4
2048 MB 512 MB 512 MB 512 MB 512 MB
1024 MB 512 MB 512 MB C-RIMM C-RIMM
1024 MB 256 MB 256 MB 256 MB 256 MB
512 MB 128 MB 128 MB 128 MB 128 MB