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64 Installing System Components
• Channel 2 contains DIMM_3, DIMM_7.
• Channel 3 contains DIMM _4, DIMM _8.
The first DIMM socket of each channel has white release tabs.
General Memory Module Installation Guidelines
To ensure optimal performance of your system, observe the following guidelines when configuring your
system memory.
• Use only qualified FBDs. FBDs can be either s
ingle-ranked
or d
ual-ranked
. FBDs m
arked with a 1R
are single
-r
anked and modules marked with a 2R are dual
-r
anked.
• A minimum of two identical FBDs must be installed.
• DIMM sockets must be populated by lowest number first.
• Memory modules m
ust be installed in pairs of matched memory size, speed, and technology
, and the
total number of memory modules in the configuration must total two, four, or eight. For best system
performance, all four, or eight memory modules should be identical in size, speed, and technology.
•Memory sp
aring and
memory m
irroring require
e
ight memory, and all memory modules must be of
identical memory size, speed, and technology.
• Memory sparing and memory mirroring cannot be implemented at the same time.
Non-Optimal Memory Configurations
System performance can be affected if your memory configuration does not conform to the preceding
installation guidelines. Your system may issue an error message during startup stating that your memory
configuration is non-optimal.
Memory Sparing Support
The system supports memory sparing if eight identical memory modules are installed in the system. The
memory sparing feature must be enabled in the System Setup program and can be used only if memory
mirroring is not enabled.(See "Using the System Setup Program" on page 33.)
Memory sparing allocates four ranks of DIMM memory to the spare bank. These four ranks consist of the
first rank of memory in DIMM sockets 1 through 4. For single-rank DIMMs, the entire capacity of the
four DIMMs is allocated to sparing whereas for dual-rank DIMMs, only half of the four-DIMM capacity
is allocated to sparing. Table 3-1 shows how memory sparing splits the available and spared memory in
each of the single- and dual-ranked memory module combinations.