SGI Rackable C2112-4G3 Uživatelská příručka stáhnout pdf (Strana 63)

Installing Memory

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Memory DIMM Functionality Guidelines

Use the following guidelines when installing memory DIMMs:

The minimum memory recommended on the system is 8 GB.

• Populate the DIMMs in groups of four or eight per CPU as described in Table 5-1 on

page 35 and Table 5-2 on page 37.

• A minimum of one DIMM per processor must always be present for the system to function.

• Mixing DIMM Sizes - When mixing DIMMs on a processor that has a mixed number of

ranks, it is recommended to have the total number of ranks on each channel be the same to

avoid bandwidth degradation. Example: placing a single-rank DIMM and a dual-rank

DIMM on the same channel is not desirable.

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

Two conditions must be met to have a memory speed of 1333 MT/s:

• The processor must be capable of supporting 1333 MT/s

• The DIMM must be capable of running at 1333 MT/s

See the section “Configuring DIMM Memory for Best Performance” for additional

processor/memory combination performance tips.

Configuring DIMM Memory for Best Performance

In addition to the rules listed in the previous subsection (“Memory DIMM Functionality

Guidelines”), use the following guidelines to maximize processor/DIMM performance:

• For maximum memory performance, the DIMMs on a processor must be identical in:

– Speed (1066 or 1333 MT/sec)

– Number of ranks (1 or 2) - use of quad-rank DIMMs will reduce overall performance

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

DIMM capacity, speed and rank configuration is balanced across all memory channels.

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SGI Rackable C2112-4G3 Uživatelská příručka Strana 63