Memory Mirroring Support
The system supports memory mirroring if 16 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
Table 3-1. Valid Memory Configurations
| Branch 0 |
| Branch 1 |
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Number of | Channel 0 | Channel 1 | Channel 2 | Channel 3 | Available Redundant |
DIMMS | (Riser A) | (Riser B) | (Riser C) | (Riser D) | Memory Modes |
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1 | DIMM A1 | (riser only) | (riser only) | (riser only) | None |
4 | DIMM A1 | DIMM B1 | DIMM C1 | DIMM D1 | None |
8DIMM A1 DIMM B1 DIMM C1 DIMM D1 None
DIMM A2 DIMM B2 DIMM C2 DIMM D2
12DIMM A1 DIMM B1 DIMM C1 DIMM D1 None
DIMM A2 DIMM B2 DIMM C2 DIMM D2 DIMM A3 DIMM B3 DIMM C3 DIMM D3
16 | DIMM A1 | DIMM B1 | DIMM C1 | DIMM D1 Spare Mode / Mirror | |
| DIMM A2 | DIMM B2 | DIMM C2 | DIMM D2 | Mode |
| DIMM A3 | DIMM B3 | DIMM C3 | DIMM D3 |
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| DIMM A4 | DIMM B4 | DIMM C4 | DIMM D4 |
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20 | DIMM A1 | DIMM B1 | DIMM C1 | DIMM D1 Spare Mode / Mirror | |
| DIMM A2 | DIMM B2 | DIMM C2 | DIMM D2 | Mode |
| DIMM A3 | DIMM B3 | DIMM C3 | DIMM D3 |
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| DIMM A4 | DIMM B4 | DIMM C4 | DIMM D4 |
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| DIMM A5 | DIMM B5 | DIMM C5 | DIMM D5 |
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94
Installing System Components
