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Table 3. Memory module installation rules for servers with two microprocessors
CPU1 DIMM
CPU2 DIMM
A1
A2
B1
B2
C1
C2
D1
D2
A1
A2
B1
B2
C1
C2
D1
D2
4 DIMMs
X
X
X
X
8 DIMMs
X
X
X
X
X
X
X
X
16 DIMMs
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
The following section explains the memory module installation rules in independent mode, mirroring mode,
sparing mode, and lockstep mode.
Memory module installation order in independent mode
In independent mode, the RAS features are not available. For information about the RAS features, refer to
the related section in “Features” on page 8.
Note:
All memory modules to be installed must be the same type (LV RDIMM or RDIMM). It is also
recommended that all memory modules have the same frequency, voltage, and number of ranks.
The following table explains the memory module installation order for servers that have only one
microprocessor (CPU1) installed.
Table 4. Memory module installation order in independent mode for servers with one microprocessor
CPU1 DIMM
A1
A2
B1
B2
C1
C2
D1
D2
DIMM
installation order
1
5
2
6
3
7
4
8
The following table explains the memory module installation order for servers that have two microprocessors
(CPU1 and CPU2) installed.
Table 5. Memory module installation order in independent mode for servers with two microprocessors
CPU1 DIMM
CPU2 DIMM
A1
A2
B1
B2
C1
C2
D1
D2
A1
A2
B1
B2
C1
C2
D1
D2
DIMM
installation order
1
9
3
11
5
13
7
15
2
10
4
12
6
14
8
16
Memory module installation order in mirroring mode
In mirroring mode, the server maintains two identical copies of all data in memory and the RAS features are
available. For information about the RAS features, refer to the related section in “Features” on page 8.
Note:
All memory modules to be installed must be the same type (LV RDIMM or RDIMM). It is also
recommended that all memory modules have the same frequency, voltage, and number of ranks.
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
CPU1 DIMM
A1
A2
B1
B2
C1
C2
D1
D2
DIMM
installation order
1
5
2
6
3
7
4
8
Chapter 6
.
Replacing hardware
83
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