Chapter 4. IBM System x3690 X5 135
Table 4-8 One or two processor DIMM installation when the memory mezzanine is not installed
Two processors with memory mezzanine installed
With two processors installed in the system, memory is evenly distributed between both
processors, which maximizes system performance.
Install the memory in the order that is listed in Table 4-9 on page 136. You are required to
install a minimum of four DIMMs.
Figure 4-15 on page 136 shows the DIMM numbering on the memory mezzanine.
Number of
processors
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.
Memory buffer Memory buffer Memory buffer Memory buffer
DIMM 1
DIMM 2
DIMM 3
DIMM 4
DIMM 5
DIMM 6
DIMM 7
DIMM 8
DIMM 9
DIMM 10
DIMM 11
DIMM 12
DIMM 13
DIMM 14
DIMM 15
DIMM 16
1 or 2 2 N x x
1 or 2 4
Y x x x x
1 or 2 6 N
x x x x x x
1 or 2 8
Y x x x x x x x x
1 or 2 10 N
x x x x x x x x x x
1 or 2 12
Y x x x x x x x x x x x x
1 or 2 14 N
x x x x x x x x x x x x x x
1 or 2 16
Y x x x x x x x x x x x x x x x x
Important: If using two processors with no mezzanine board, memory is not in a
nonuniform memory access (NUMA)-compliant state, which causes great performance
degradation. See 2.3.4, “Nonuniform memory architecture (NUMA)” on page 26 for details.
Important VMware ESX considerations: When installing and running VMware ESX on
this server, the operating system might fail to install or boot with the following error
message when the server memory configuration is not NUMA-compliant:
“NUMA node 1 has no memory”
There are only three possible configurations to support VMware:
One processor is installed and no mezzanine board is installed.
Two processors are installed and matching memory is installed on both the system
board and the mezzanine board.
Two processors are installed, no internal memory is installed, and the memory installed
in an attached MAX5 memory expansion is configured as non-pooled memory.
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