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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 rst.
• 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.
Figure42. 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 conguration is supported only when you are using normal RDIMMs.
78 ThinkServer RD540 User Guide and Hardware Maintenance Manual