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5: Advanced Severboard Setup

of ranks. If this option is used, populate the higher ranking DIMMs furthest from the

processor (slot A).

• For maximum memory performance the DIMMs within a node must be identical in:

– Speed (1066 or 1333 Mtransfer/sec)

– Number of ranks (1 or 2)

Note: The speed of the memory controller will reduce to the lowest speed DIMM on the channel.

• When configuring the memory for maximum performance, it is critical that the memory

DIMM capacity is balanced across all memory channels.

• When configuring the memory for maximum performance, it is critical that the memory

DIMM capacity is balanced across all memory channels.

Note: The key words are “memory capacity”.

Note: The maximum speed of the memory controller changes based on the number of DIMMs

placed on the channel:

• Three DIMMs on the channel the maximum speed supported is 800 MT/s

• Two DIMMs on the channel the maximum speed supported is 1066 MT/s

• One DIMM on the channel the maximum speed supported is 1333 MT/s

Note: Reason for the decrease in memory performance - as more DIMMs are added to a channel

the noise on the channel increases and the voltage levels decrease due to signal loading. As a result

we have to lower the frequency that we run the channel as more DIMMs are added.

See Table 5-2 for the recommended DIMM configurations that will achieve the maximum

memory performance.

Memory DIMM configurations that are describe in Table 5-3 will run with degraded performance.

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