Dell Precision 620 User Manual download pdf (Page 11)

ALERT! Cover was previously removed.

9. To reset the chassis intrusion detector, enter System Setup, select System Security, and reset Chassis Intrusion to Enabled, Enabled-

Silent, or Disabled.

Removing an Expansion Card

1. Remove the computer cover.

2. Remove the AGP card brace according to the instructions in "Removing and Replacing the AGP Card Brace."

3. 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 removing the card permanently, install a metal filler bracket over the empty card-slot opening.

7. Replace the AGP card brace.

8. Replace the computer cover, reconnect your computer and peripherals to their electrical outlets, and turn them on.

ALERT! Cover was previously removed.

9. To reset the chassis intrusion detector, enter System Setup, select System Security, and reset Chassis Intrusion to Enabled, Enabled-

Silent, or Disabled.

Adding Memory

Dell Precision 620 systems support dual direct Rambus dynamic random-access memory (RDRAM) channels. The channels are designated as

memoryexpansioncards(MEC)AandB.Rambusin-line memory modules (RIMMs) feature error checking and correction (ECC).

Dell Precision 620 systems support a maximum of 8 RIMMs (4 RIMMs per MEC) for up to 2 gigabytes (GB) of total memory.

When you add system memory (RIMMs), you must fill the memory module sockets with pairs of memory modules of equal memory capacity,

number of components, and speed. Install one memory module of each pair in the corresponding numbered socket on each MEC.

Figure 5. RIMM Socket Sequence

NOTE: If a setup password has been assigned by someone else, contact the network administrator for information on resetting the

chassis intrusion detector.

NOTICE: See "Protecting Against Electrostatic Discharge" in your Dell Precision WorkStations System Information 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.

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:

NOTE: If a setup password has been assigned by someone else, contact the network administrator for information on

resetting the chassis intrusion detector.

NOTE: The memory module in each socket on one MEC must be the same memory capacity, number of components, and speed as

the corresponding memory module in the same socket on the other MEC.

NOTES: When you add RIMMs, you must install the memory module pairs in the following sequence: RIMM2_A, RIMM1_A,

RIMM3_B, and RIMM4_B or (see Figure 5). If socket RIMM1_A is empty, you must install a Rambus Continuity Module (C-RIMM) in

that socket on each MEC. If RIMM2_A through RIMM3_B contain RIMMs, but socket RIMM4_B is empty, you must install a C-RIMM in

that socket on each MEC.

If you are installing 512-MB RIMMs, you must install the memory module pairs in the following sequence: RIMM3_B, RIMM4_B, and

RIMM2_A. You must also install a C-RIMM in socket RIMM1_A.

Also, you cannot mix 288- and 144-MB technology in the upper two sockets of each memory riser.

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Dell Precision 620 User Manual Page 11