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Installing System Components 85
Memory Mirroring Support
The system supports memory mirroring if eight or twelve identical memory modules are installed in the
system. Mirroring must be enabled in the System Setup program and can be used only if memory sparing
is not enabled. In a mirrored configuration, the total available system memory is one-half of the total
installed memory.
Installing Memory Modules
CAUTION: Only trained service technicians are authorized to remove the system cover and access any of the
components inside the system. 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 Open the system. See
"Opening the System" on page 53
.
3 Remove the memory cooling shroud. See
"Removing the Cooling Shroud" on page 79
.
NOTICE: Never remove the memory cooling shroud without first powering down the system. Overheating of the
system can develop quickly resulting in a shutdown of the system and the loss of data.
4 Locate the memory module sockets on the system board. See
Figure 6-2
.
CAUTION: The DIMMs are hot to the touch for some time after the system has been powered down. Allow time
for the DIMMs to cool before handling them. Handle the DIMMs by the card edges and avoid touching the DIMM
components.
5 Press the ejectors on the memory module socket down and out, as shown in
Figure 3-22
, to allow the
memory module to be inserted into the socket.
12 256-MB single-rank 3 GB 2 GB 1 GB
512-MB single-rank 6 GB 4 GB 2 GB
1-GB single-rank 12 GB 8 GB 4 GB
2-GB single-rank 24 GB 16 GB 8 GB
2-GB dual-rank 24 GB 20 GB 4 GB
4-GB dual-rank 48 GB 40 GB 8 GB
Table 3-1. Memory Sparing Configurations (continued)
DIMMs Size/Type Total Memory Available Spare