Pair number 2 Processor system (socket 0 and 1) 1 Processor system (socket 0)
Memory
expansion board
Memory slots Memory
expansion
board
Memory slots
8 Memory
expansion board
4
1B and 6B — —
9 Memory
expansion board
1
2C and 5C — —
10 Memory
expansion board
3
2C and 5C — —
11 Memory
expansion board
2
2C and 5C — —
12 Memory
expansion board
4
2C and 5C — —
TIP:
You can load DIMM pairs on a single expansion board at a time, but this option reduces system
performance.
Memory loading rules and guidelines
•
CAUTION:
Failure to observe the following cautions results in system degradation or failure:
• Only ECC DIMMs are supported.
• Load DIMM pairs from largest to smallest capacity. For example, if you have a pair of 4 GB DIMMs
and a pair of 2 GB DIMMs, install the pair of 4 GB DIMMs first.
NOTE:
Faster DIMMs and slower DIMMs can be installed on different slots within the same channel, but
faster DIMMs operate at the timing of the slowest DIMM populated.
• Alternate loading between installed processors. Do not install DIMMs if the corresponding processor is
not installed.
• Spread DIMMs evenly between processors.
• Load DIMMs in pairs by increasing letter.
• For best performance, install DIMM pairs in the specified sequence shown in Memory Load Order.
DIMMs can be loaded in an economic order, for example, loading the first expansion board full before
66 Memory loading rules and guidelines
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