Lenovo ThinkServer RD440 - Manual (Page 114)

The following table explains the memory module installation rules for servers that have two microprocessors
(CPU1 and CPU2) installed. The “X” mark indicates the memory slots into which the memory modules
should be installed in different situations.
Figure 60. CPU1 DIMMs and CPU2 DIMMs
Table 4. Memory module installation rules for servers with two microprocessors
CPU1 DIMM CPU2 DIMM
A1 A2 B1 B2 C1 C2 A1 A2 B1 B2 C1 C2
Two DIMMs X X
Four DIMMs X X X X
Six DIMMs X X X X X X
Eight DIMMs X X X X X X X X
Twelve DIMMs X X X X X X X X X X X X
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 85.
This topic provides instructions on how to install a memory module.
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 99.
• 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:
1. Remove all media from the drives and turn off all attached devices and the server. Then, disconnect all
power cords from electrical outlets and disconnect all cables that are connected to the server.
102 ThinkServer RD440 User Guide and Hardware Maintenance Manual