User`s guide

Node Board
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Memory DIMM Pairs
Table 2-3 lists the memory DIMM pairs for the SGI Virtu VN200.
Memory Configuration Rules
• You can install a minimum of 2 and a maximum of 8 FBDIMMs on the node board.
• You must install FB-DIMMs in pairs (refer to Table 2-3).
• Both FB-DIMMs within a pair must have the same capacity and speed.
• 800-MT/s FB-DIMMs require 1600-MT/s processors to run at full speed.
• To configure memory for maximum performance, balance the DIMM capacity
across both memory branches; for example, if you install 2GB of memory in
Branch
0, you must also configure 2GB of memory in Branch 1 (refer to Figure 2-9).
• Unbalanced branch configurations can reduce overall memory performance up to
40%.
Memory Part Numbers
Table 2-4 lists the SGI Virtu VN200 memory sizes and their SGI part numbers.
Table 2-3 Memory DIMM Pairs
DIMM Pair DIMM Slot
Pair 1 1A and 2A
Pair 2 3A and 4A
Pair 3 1B and 2B
Pair 4 3B and 4B