Lenovo ThinkServer RD650 User Manual And Hardware Maintenance Manual page 96

The following table explains the memory module installation order for servers that have only one
microprocessor (CPU1) installed.
Table 6. Memory module installation order in mirroring mode for servers with one microprocessor
A1
CPU1 DIMM
DIMM installation
1
order
The following table explains the memory module installation order for servers that have two microprocessors
(CPU1 and CPU2) installed.
Table 7. Memory module installation order in mirroring mode for servers with two microprocessors
A1 A2 A3 B1 B2 B3 C1 C2 C3 D1 D2 D3 A1 A2 A3 B1 B2 B3 C1 C2 C3 D1 D2 D3
DIMM installation
1
order
Memory module installation order in sparing mode
The sparing mode provides memory redundancy. In this mode, the RAS features are available. For more
information about the RAS features, refer to the related section in "Features" on page 7.
Note: All memory modules to be installed must be the same type with the same capacity, frequency,
voltage, and number of ranks.
Your server supports rank sparing mode. In rank sparing mode, one rank of a memory module works as the
spare rank for the other ranks on the same channel. The spare rank is not available as system memory. To
enable rank sparing mode, ensure that:
• At least three ranks are available in one channel.
• At least two memory modules are installed in one channel.
The following table explains the memory module installation order for servers that have only one
microprocessor (CPU1) installed.
Table 8. Memory module installation order in sparing mode for servers with one microprocessor
CPU1 DIMM A1
DIMM installation
1
order
The following table explains the memory module installation order for servers that have two microprocessors
(CPU1 and CPU2) installed.
Table 9. Memory module installation order in sparing mode for servers with two microprocessors
A1 A2 A3 B1 B2 B3 C1 C2 C3 D1 D2 D3 A1 A2 A3 B1 B2 B3 C1 C2 C3 D1 D2 D3
DIMM installation
1
order
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ThinkServer RD650 User Guide and Hardware Maintenance Manual
A2 A3 B1
3 5 1
CPU1 DIMM
5 9 1 5 9 3 7
A2 A3 B1
1 5 2
CPU1 DIMM
1 9 3 3 11 5 5
B2 B3
C1
3 5 2
11 3 7 11 2 6 10 2
B2 B3 C1
2 6 3
13 7 7 15 2 2 10 4
D1 D2
C2 C3
4 6 2 4
CPU2 DIMM
6 10 4 8 12 4
C2 C3 D1 D2
3 7 4 4
CPU2 DIMM
4 12 6 6 14 8
D3
6
8 12
D3
8
8 16