System Memory; General Memory Module Installation Guidelines; Installing Memory Modules - Dell PowerEdge 850 Installation And Troubleshooting Manual

7. If you are removing the card permanently, install a metal filler bracket over the empty expansion slot opening and close the expansion-card latch.
8. Install the cover. See "Replacing the
9. Stand the system upright.
10. Install the bezel. See "Installing the
11. Reconnect the system to its electrical outlet and turn the system on, including any attached peripherals.
System Memory
You can upgrade your system memory to a maximum of 4 GB by installing combinations of 256-MB, 512-MB, or 1-GB 2-way unbuffered ECC DDR 2 400/533
memory modules. The system memory is located on the system board adjacent to the power supply bays. See Figure A-3. The memory module sockets are
arranged in two banks on two channels (A and B). The memory module banks are identified as follows:
Bank 1: DIMM1_A and DIMM1_B
l
Bank 2: DIMM2_A and DIMM2_B
l

General Memory Module Installation Guidelines

If only one memory module is installed, it must be installed in socket DIMM1_A.
l
If two or more memory modules are installed, they must be installed in pairs of matched memory size, speed, and technology.
l
Table 6-1 shows examples of different memory configurations.
Table 6-1. Sample Memory Configurations
Total Memory DIMM1_A DIMM2_A
256 MB 256 MB none
512 MB 256 MB none
512 MB 512 MB none
1 GB 256 MB 256 MB
1 GB 512 MB none
1 GB 1 GB none
1.5 GB 512 MB 256 MB
2 GB 512 MB 512 MB
2 GB 1 GB none
3 GB 1 GB 512 MB
4 GB 1 GB 1 GB

Installing Memory Modules

CAUTION: See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting
against electrostatic discharge.
1. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.
2. Remove the bezel. See "Removing the
3. Lay the system on its right side.
4. Remove the cover. See "Removing the
5. Remove the cooling shroud. See
6. Locate the memory module sockets. See Figure A-3.
7. Press the ejectors on the memory module socket down and out, as shown in Figure 6-8, to allow the memory module to be inserted into the socket.
Figure 6-8. Installing and Removing a Memory Module
Cover" in "Troubleshooting Your System."
Bezel" in "Troubleshooting Your System."
DIMM1_B DIMM2_B Memory Mode
none none Single channel
256 MB none Dual channel, interleaved
none none Single channel
256 MB 256 MB Dual channel, interleaved
512 MB none Dual channel, interleaved
none none Single channel
512 MB 256 MB Dual channel, interleaved
512 MB 512 MB Dual channel, interleaved
1 GB none Dual channel, interleaved
1 GB 512 MB Dual channel, interleaved
1 GB 1 GB Dual channel, interleaved
Bezel" in "Troubleshooting Your System."
Cover" in "Troubleshooting Your System."
"Removing the Cooling Shroud."