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Memory Performance

DIMMs Per CPU

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

8 (CPU1)

and 4 (CPU2)

Not recommended for performance

reasons.

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

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,

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