Lenovo ThinkServer RD650 User Manual
Page 95
Table 3. Memory module installation rules for servers with two microprocessors (continued)
CPU1 DIMM
CPU2 DIMM
A1 A2 A3 B1 B2 B3 C1 C2 C3 D1 D2 D3 A1 A2 A3 B1 B2 B3 C1 C2 C3 D1 D2 D3
16
DIMMs
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
24
DIMMs
X
X
X
X
X
X
X
X
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 more information about the RAS features,
refer to the related section in “Features” on page 7.
Notes:
• All memory modules to be installed must be the same type.
• When you install memory modules with different capacity, install the memory module that has the
highest capacity first.
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
A3
B1
B2
B3
C1
C2
C3
D1
D2
D3
DIMM installation
order
1
5
9
2
6
10
3
7
11
4
8
12
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 A3 B1 B2 B3 C1 C2 C3 D1 D2 D3 A1 A2 A3 B1 B2 B3 C1 C2 C3 D1 D2 D3
DIMM installation
order
1
9
17 3
11 19 5
13 21 7
15 23 2
10 18 4
12 20 6
14 22 8
16 24
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 more information about the RAS features, refer to the related section in “Features” on page 7.
Notes:
• All memory modules to be installed must be the same type with the same capacity, frequency, voltage,
and number of ranks.
• All memory modules must be installed in pairs.
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