Cisco UCS B200 M4 Servicing Manual - Page 16
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Memory Performance
DIMMs Per CPU
2
3
4
8
12
Note
System performance is optimized when the DIMM type and quantity are equal for both CPUs, and when each
populated channel is filled equally across the CPUs in the server.
Table 2: Supported DIMM Population Order (Mirroring)
DIMMs per CPU
2
4
8
8 (CPU1)
and 4 (CPU2)
Not recommended for performance
reasons.
12
Memory Performance
When considering the memory configuration of the blade server, there are several things to consider. For
example:
• When mixing DIMMs of different densities (capacities), the highest density DIMM goes in slot 1 then
• Besides DIMM population and choice, the selected CPU(s) can have some effect on performance.
• DIMMs can be run in a 1DPC, a 2DPC, or a 3DPC configuration. 1DPC and 2DPC can provide the
Servicing a Blade Server
16
in descending density.
maximum rated speed that the CPU and DIMMs are rated for. 3DPC causes the DIMMs to run at a slower
speed.
CPU 1 Installed Slots
A1, B1
A1, B1, C1
A1, B1, C1, D1
A1, B1, C1, D1, A2, B2, C2, D2
A1, B1, C1, D1, A2, B2, C2, D2,
A3, B3, C3, D3
CPU 1 Installed Slots
A1, B1
A1, B1, C1, D1
A1, B1, C1, D1, A2, B2, C2, D2
A1, B1, C1, D1, A2, B2, C2, D2
A1, B1, C1, D1, A2, B2, C2, D2,
A3, B3, C3, D3
Servicing a Blade Server
CPU 2 Installed Slots
E1, F1
E1, F1, G1
E1, F1, G1, H1
E1, F1, G1, H1, E2, F2, G2, H2
E1, F1, G1, H1, E2, F2, G2, H2,
E3, F3, G3, H3
CPU 2 Installed Slots
E1, F1
E1, F1, G1, H1
E1, F1, G1, H1, E2, F2, G2, H2
E1, F1, E2, F2
E1, F1, G1, H1, E2, F2, G2, H2,
E3, F3, G3, H3