Lenovo ThinkServer RD650 User Manual And Hardware Maintenance Manual page 95

Table 3. Memory module installation rules for servers with two microprocessors (continued)
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
X X
DIMMs
24
X X X
DIMMs
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
DIMM installation
1
order
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
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 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.
CPU1 DIMM
X X X X
X X X X X X
A2 A3 B1
5 9 2
CPU1 DIMM
9 17 3 11 19 5 13 21 7
X X X X
X X X X X X
B2 B3 C1
6 10 3
15 23 2 10 18 4
CPU2 DIMM
X X X X
X X X X X X
C2 C3 D1 D2
7 11 4
CPU2 DIMM
12 20 6 14 22 8
.
Chapter 6 Replacing hardware
X X
X X X
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