you must install two identical DIMMs at a time, in the order shown in the
following table, to maintain performance.
Table 2. DIMM installation sequence
Pair DIMM connectors
1 1 and 3
2 5 and 7
3 2 and 4
4 6 and 8
DIMM 5 connector
DIMM 1 connector
DIMM 6 connector
DIMM 2 connector
DIMM 7 connector
DIMM 3 connector
DIMM 8 connector
DIMM 4 connector
Branch 1
Branch 0
Channel 2
Channel 1
Channel 3
Channel 0
v Each DIMM in a pair must be the same size, speed, type, and technology to
ensure that the server will operate correctly.
v You can configure the server to use memory mirroring. Memory mirroring stores
data in two pairs of DIMMs simultaneously. If a failure occurs, the memory
controller switches from the active pair to the mirroring pair. Memory mirroring
reduces the amount of available memory. Enable memory mirroring through the
Configuration/Setup Utility program.
When you use memory mirroring, you must install two pairs of DIMMs at a time.
The four DIMMs in each group must be identical. See the following table for the
installation sequence of DIMM connectors for memory mirroring.
Figure 1. DIMM connectors, channels, and branches
20 IBM System x3550 Type 7978: Installation Guide
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