Installing A Memory Module - Lenovo ThinkServer RD450 User Manual And Hardware Maintenance Manual

The following table explains the memory module installation order for servers that have two microprocessors
(CPU1 and CPU2) installed.
Table 8. Memory module installation order in sparing mode for servers with two microprocessors
DIMM installation order
Memory module installation order in lockstep mode
In lockstep mode, 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.
The following table explains the memory module installation order for servers that have only one
microprocessor (CPU1) installed.
Table 9. Memory module installation order in lockstep mode for servers with one microprocessor
CPU1 DIMM
DIMM installation order
The following table explains the memory module installation order for servers that have two microprocessors
(CPU1 and CPU2) installed.
Table 10. Memory module installation order in lockstep mode for servers with two microprocessors
DIMM installation order

Installing a memory module

Attention: Do not open your server or attempt any repair before reading and understanding "Safety information"
on page iii and "Guidelines" on page 59.
Before you begin, print all the related instructions or ensure that you can view the PDF version on another
computer for reference.
Notes:
• Ensure that you consider and follow the memory module installation rules when performing the operation.
See "Memory module installation rules" on page 70.
• Use any documentation that comes with the memory module and follow those instructions in addition to
the instructions in this topic.
To install a memory module, do the following:
74
ThinkServer RD450 User Guide and Hardware Maintenance Manual
CPU1 DIMM
A1 A2 B1 B2 C1
1 1 3 3 5
A1 A2 B1
1 3
CPU1 DIMM
A1 A2 B1 B2 C1
1 5 1 5 3
C2 D1 D2 A1 A2
5 7 7 2 2
B2 C1
1 3 2
C2 D1 D2 A1 A2
7 3 7 2 6
CPU2 DIMM
B1 B2 C1 C2 D1
4 4 6 6 8
C2 D1 D2
4 2
CPU2 DIMM
B1 B2 C1 C2 D1
2 6 4 8 4
D2
8
4
D2
8