76 IBM eX5 Implementation Guide
3.8 Memory
Memory is installed in the x3850 X5 in memory cards. Up to eight memory cards can be
installed in the server, and each card holds eight DIMMs. Therefore, the x3850 X5 supports
up to 64 DIMMs.
This section includes the following topics:
3.8.1, “Memory cards and DIMMs” on page 76
3.8.2, “DIMM population sequence” on page 79
3.8.3, “Maximizing memory performance” on page 84
3.8.4, “Memory mirroring” on page 87
3.8.5, “Memory sparing” on page 89
3.8.6, “Effect on performance by using mirroring or sparing” on page 89
3.8.1 Memory cards and DIMMs
This section describes the available memory options for the x3850 X5 and the MAX5.
Memory cards for the x3850 X5
The x3850 X5, like its predecessor the x3850 M2, uses memory cards to which the memory
DIMMs are attached, as shown in Figure 3-16.
Figure 3-16 x3850 x5 memory card
Two scalable
memory buffers
DIMM 8
DIMM 1
Chapter 3. IBM System x3850 X5 and x3950 X5 77
Standard models contain two or more memory cards. You can configure additional cards, as
listed in Table 3-10.
Table 3-10 IBM System x3850 X5 and x3950 X5 memory card
The memory cards are installed in the server, as shown in Figure 3-17. Each processor is
electrically connected to two memory cards as shown (for example, processor 1 is connected
to memory cards 1 and 2).
Figure 3-17 Memory card and processor enumeration
Part number Feature code Description
46M0071 5102 IBM x3850 X5 and x3950 X5 Memory Expansion Card
Memory cards 1 - 8
Processors 1 - 4
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