IBM BladeCenter HX5, Installation And User Manual, Page: 44 / 142

Table 2. DIMM population rules
DIMM Grouping A
All DIMMs in this group must be the same technology (DRAM size, such as 2 Gbit)
DIMM 1, DIMM
8 DIMM 2, DIMM 7 All DIMMs must be the same DRAM width (such
as 4R x 8)
DIMM 3, DIMM
6 DIMM 4, DIMM 5 All DIMMs must be the same DRAM width (such
as 4R x 8)
DIMM Grouping B
All DIMMs in this group must be the same technology (DRAM size, such as 2 Gbit)
DIMM 13,
DIMM 17 DIMM 14, DIMM18 All DIMMs must be the same DRAM width (such
as 4R x 8)
DIMM 15,
DIMM 19 DIMM 16, DIMM 20 All DIMMs must be the same DRAM width (such
as 4R x 8)
DIMM Grouping C
All DIMMs in this group must be the same technology (DRAM size, such as 2 Gbit)
DIMM 9, DIMM
21 DIMM 10, DIMM 22 All DIMMs must be the same DRAM width (such
as 4R x 8)
DIMM 11,
DIMM 23 DIMM 12, DIMM 24 All DIMMs must be the same DRAM width (such
as 4R x 8)
Notes:
v 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.
v
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 3 through Table 5 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 3. System memory configuration for performance
Installed
memory
DIMM connector
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
2 DIMMs X X
4 DIMMs X X X X
6 DIMMs X X X X X X
8 DIMMs X X X X X X X X
10 DIMMs X X X X X X X X X X
12 DIMMs X X X X X X X X X X X X
14 DIMMs X X X X X X X X X X X X X X
16 DIMMs X X X X X X X X X X X X X X X X
34
IBM BladeCenter HX5 Type 7873, 7872, 1910, and 1909: Installation and User's Guide