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Memory must be installed in pairs of DIMMs. Observe the following rules with populating the IBM MAX5
expansion blade:
Table 3. DIMM population rules
All DIMMs in this group must be the same technology (DRAM size, such as 2 Gbit)
DIMM 1, DIMM 8
DIMM 2, DIMM 7
DIMM 3, DIMM 6
DIMM 4, DIMM 5
All DIMMs in this group must be the same technology (DRAM size, such as 2 Gbit)
DIMM 13, DIMM 17
DIMM 14, DIMM18
DIMM 15, DIMM 19
DIMM 16, DIMM 20
All DIMMs in this group must be the same technology (DRAM size, such as 2 Gbit)
DIMM 9, DIMM 21
DIMM 10, DIMM 22
DIMM 11, DIMM 23
DIMM 12, DIMM 24
Notes:
• Each DIMM pair must be the exact same size and speed. For example, DIMM 1 and DIMM 8 must be the
same size and speed. DIMM 2 and DIMM 7 must be the same size and speed. However, DIMM 1 and
DIMM 2 have to be the same technology, but they do not need to be the same size and speed.
• When populating the IBM MAX5, use the DIMMs with the greatest size first. For example, install all 8 GB
DIMMs before you install 4 GB DIMMs. Populate the DIMMs according to the DIMM population table for
your environment. See Table 4 "System memory configuration for performance" on page 34 through Table
6 "System memory configuration for mirroring with power savings (uses a maximum of 16 DIMMs)" on
page 35 for the DIMM population order.
The installation order for DIMMs depends on whether you intend to optimize the DIMM installation for
performance or for power saving.
The following table lists the memory configurations and installation order to optimize the IBM MAX5 for
performance.
Table 4. System memory configuration for performance
Installed
memory
1
2
2 DIMMs
X
4 DIMMs
X
6 DIMMs
X
8 DIMMs
X
10 DIMMs
X
12 DIMMs
X
34
BladeCenter HX5 Blade ServerInstallation and User's Guide
DIMM Grouping A
DIMM Grouping B
DIMM Grouping C
5
6
7
8
9
3
4
X
X
X
X
X
X
X
X
X
X
X
X
All DIMMs must be the same DRAM width (such as 4R x 8)
All DIMMs must be the same DRAM width (such as 4R x 8)
All DIMMs must be the same DRAM width (such as 4R x 8)
All DIMMs must be the same DRAM width (such as 4R x 8)
All DIMMs must be the same DRAM width (such as 4R x 8)
All DIMMs must be the same DRAM width (such as 4R x 8)
DIMM connector
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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