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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 slot(s) into which the memory module(s)
should be installed in different situations.
Note: All memory modules to be installed on a server must be the same type (LV RDIMM or RDIMM) with
the same rank, voltage, and frequency.
Figure 35. CPU1 DIMMs and CPU2 DIMMs
Table 5. 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 67.
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:
• To optimize system performance, ensure that you consider and follow the memory module installation
rules when performing the operation. See “Memory module installation rules” on page 75
.
• Use any documentation that comes with the memory module and follow those instructions in addition to
the instructions in this topic.
78 ThinkServer RD330 User Guide