Silicon Graphics Rackable H2106-G7, System User'S Manual

Page: 63 / 112

Installing Memory
007-5683-004 39
Table 5-2
32-DIMM Configuration (8 per CPU)
Memory DIMM Layout
The H2106-G7 memory bus is a quad-channel controller intended for use with four processor
configurations. Note that memory DIMM slots should be populated equally in adjacent memory
banks on each channel.
Memory DIMM Rules
Use the following rules when installing memory DIMMs:
The minimum memory recommended on the system is 16 GB.
• Populate the DIMMs in groups of four or eight per CPU as described in Table 5-1 on
page 38 and Table 5-2 on page 39 .
• A minimum of four DIMMs per processor must always be present.
• Mixing DIMM Sizes - When mixing DIMMs on a channel that has a mixed number of ranks,
it is recommended to have the total number of ranks on the channel be even to avoid
bandwidth degradation. Example: placing a single-rank DIMM and a dual-rank DIMM on
the same channel is not desirable.
• For maximum memory performance the DIMMs within a node must be identical in:
– Speed (for example - 1600 Mtransfer/sec)
– Number of ranks (1 or 2)
#DIMMs CPU Channel 1 Channel 2 Channel 3 Channel 4
32 DIMMs CPU1 P1-1A & P1-1B P1-2A & P1-2B P1-3A & P1-3B P1-4A & P1-4B
CPU2 P2-1A & P2-1B P2-2A & P2-2B P2-3A & P2-3B P2-4A & P2-4B
CPU3 P3-1A & P3-1B P3-2A & P3-2B P3-3A & P3-3B P3-4A & P3-4B
CPU4 P4-1A & P4-1B P4-2A & P4-2B P4-3A & P3-3B P4-4A & P4-4B