80 IBM eX5 Implementation Guide
Installing DIMMs in the x3850 X5 and MAX5 in the correct order is essential for system
performance. See “Mixed DIMMs and the effect on performance” on page 86 for performance
effects when this guideline is not followed.
x3850 X5 single-node and 2-node configurations
Table 3-13 is the same if you use a single-node configuration or if you use a 2-node
configuration. In a 2-node configuration, you install in the same order twice, once for each
server.
Table 3-13 shows the NUMA-compliant memory installation sequence for two processors.
Table 3-13 NUMA-compliant DIMM installation (two processors): x3850 X5
Table 3-14 on page 81 shows the NUMA-compliant memory installation sequence for three
processors.
Tip: The tables in this section list only memory configurations that are considered the best
practices in obtaining the optimal memory and processor performance.
For a full list of supported memory configurations, see the IBM System x3850 X5
Installation and User’s Guide or the IBM System x3850 X5 Problem Determination and
Service Guide. We list the download links to these documents in “Related publications” on
page 541.
Number of DIMMs
Hemisphere Mode
a
a. For more information about Hemisphere Mode and its importance, see 2.3.5,
“Hemisphere Mode” on page 26.
Processor 1 Processor 4
Card 1 Card 2 Card 7 Card 8
DIMM 1 and 8
DIMM 3 and 6
DIMM 2 and 7
DIMM 4 and 5
DIMM 1 and 8
DIMM 3 and 6
DIMM 2 and 7
DIMM 4 and 5
DIMM 1 and 8
DIMM 3 and 6
DIMM 2 and 7
DIMM 4 and 5
DIMM 1 and 8
DIMM 3 and 6
DIMM 2 and 7
DIMM 4 and 5
4Nx x
8
Y x x x x
12 N
x x x x x x
16
Y x x x x x x x x
20 N
x x x x x x x x x x
24
Y x x x x x x x x x x x x
28 N
x x x x x x x x x x x x x x
32
Y x x x x x x x x x x x x x x x x
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