Memory Dimm Rules; Figure 5-8 Memory Block Diagram - Silicon Graphics Rackable C2108-TY10 User Manual

Memory DIMM Rules

007-5688-003
Nehalem-EP
Figure 5-8
Memory Block Diagram
Use the following rules when installing memory DIMMs:
The minimum memory allowed on SGI Rackable C2108-TY10 cluster nodes is defined by
whether or not the compute nodes are diskless:
• Diskless compute nodes: 8GB per node memory minimum
• Diskful compute nodes: 4GB per node memory minimum
Memory DIMM Rules
• Populate the DIMMs in the furthest slot from the processor for channel 1, first. Then
channels 2 - 3.
• A minimum of one DIMM per processor must always be present - one for each processor.
• 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. The total number of ranks would be three - an odd number
D
Memory D
R
Channel 1
3
D
Memory
D
Channel 2
R
3
D
Memory
D
Channel 3 R
3
Installing Memory
D D
D D
R R
3 3
D D
D D
R R
3 3
D D
D D
R R
3 3
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