Lenovo ThinkServer TD350 70DG, User Manual And Hardware Maintenance Manual, Page: 97 / 220

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