Lenovo RD540 manual CPU1 Dimm

The following table explains the memory module installation rules for servers that have only one microprocessor (CPU1) installed. The “X” mark indicates the memory slots into which the memory modules should be installed in different situations.

Notes:

•All memory modules to be installed on a server must be the same type.

•When you install memory modules with different ranks in one channel, start from the farthest memory slot in the channel and install the memory module that has the most ranks first.

•When 1.35 V memory modules and 1.50 V memory modules are installed into the memory slots for the same microprocessor, all the memory modules run at 1.50 V.

•When memory modules with different frequencies are installed into the memory slots for the same microprocessor, all the memory modules run at the lowest frequency.

•It is recommended that you install the high-frequency memory modules into the memory slots for the same microprocessor to ensure high performance.

Figure 41. CPU1 DIMMs

Table 3. Memory module installation rules for servers with one microprocessor

CPU1 DIMM

A1

A2

A3

B1

B2

B3

C1

C2

C3

D1

D2

D3

One DIMM

X

Two DIMMs

X

X

Three DIMMs

X

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

Note: The 12 DIMMs configuration is supported only when you are using normal RDIMMs.

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.

Chapter 6. Installing, removing, or replacing hardware 77