Figure 19: DIMM Slot Numbering
DIMM Population Rules
Observe the following guidelines when installing or replacing DIMMs for maximum performance:
• Each CPU supports six memory channels.
• CPU 1 supports channels A, B, C, D, E, F.
• CPU 2 supports channels G, H, J, K, L, M.
• Each channel has two DIMM sockets (for example, channel A = slots A1, A2).
• In a single-CPU configuration, populate the channels for CPU1 only (A, B, C, D, E, F).
• For optimal performance, populate DIMMs in the order shown in the following table, depending on the
number of CPUs and the number of DIMMs per CPU. If your server has two CPUs, balance DIMMs
evenly across the two CPUs as shown in the table.
The table below lists recommended configurations. Using 5, 7, 9, 10, or 11 DIMMs
per CPU is not recommended.
Note
Table 4: DIMM Population Order
Populate CPU2 SlotsPopulate CPU 1 SlotNumber of
DIMMs per CPU
(Recommended
Configurations)
Black #2 Slots
Blue #1 SlotsBlack #2 SlotsBlue #1 Slots
-
(G1)-(A1)1
-(G1, H1)-(A1, B1)2
-(G1, H1, J1)-(A1, B1, C1)3
-(G1, H1); (K1, L1)-(A1, B1); (D1, E1)4
-(G1, H1); (J1, K1);
(L1, M1)
-(A1, B1); (C1, D1);
(E1, F1)
6
(G2, H2); (K2, L2)(G1, H1); (K1, L1)(A2, B2); (D2, E2)(A1, B1); (D1, E1)8
Cisco APIC M3/L3 Server Installation and Service Guide
44
Maintaining the Server
DIMM Population Rules and Memory Performance Guidelines
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