Lenovo RD540 manual CPU1 Dimm CPU2 Dimm

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 42. CPU1 DIMMs and CPU2 DIMMs

Table 4. Memory module installation rules for servers with two microprocessors

CPU1 DIMM

CPU2 DIMM

A1

A2

A3

B1

B2

B3

C1

C2

C3

D1

D2

D3

A1

A2

B1

B2

C1

C2

D1

D2

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

Sixteen DIMMs

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

Twenty DIMMs

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

Note: The 20 DIMMs configuration is supported only when you are using normal RDIMMs.

78ThinkServer RD540 User Guide and Hardware Maintenance Manual