Table 9. Supported UDIMM population per channel
DIMMs slots
per channel
DIMMs installed
in each channel DIMM type DIMM speed
Ranks per
DIMM (any
combination)
2 1 Unbuffered
DDR3 ECC
1066, 1333 single-rank,
dual-rank
2 2 Unbuffered
DDR3 ECC
1066, 1333 single-rank,
dual-rank
v The following table lists the maximum DIMM population using ranked UDIMM.
Table 10. Maximum memory population using ranked UDIMMs (depending on your model)
Number of UDIMMs DIMM type DIMM size Total memory
4 single-rank UDIMMs 1 GB 4 GB
4 single-rank UDIMMs 2 GB 8 GB
4 dual-rank UDIMMs 2 GB 8 GB
4 dual-rank UDIMMs 4 GB (when
available)
16 GB
v The following table lists the UDIMM memory population rule to optimize the
system performance.
Table 11. UDIMMs population rule for dual-channel symmetric mode
DIMMs
connector 1
DIMMs
connector 2
DIMMs
connector 3
DIMMs
connector 4
DIMMs
connector 5
DIMMs
connector 6
populated empty empty empty empty empty
populated empty empty populated empty empty
populated populated empty populated populated empty
Registered DIMMs (RDIMMs)
The following notes provide information that you must consider when you install
RDIMMs (see “System-board optional-devices connectors” on page 18 for the
location of the DIMM connectors):
v The memory channels run at the fastest common frequency of the installed
DIMMs.
v Do not use both RDIMMs and UDIMMs in the same server.
v The server supports up to three single-rank, dual-rank, or quad-rank RDIMMs per
channel.
v The RDIMM options that are available for the server are 1 GB, 2 GB, 4 GB, and
8 GB (when available) memory DIMMs.
v You can install a maximum of 32 GB of memory in the server when you use
RDIMMs.
v The following table lists the supported RDIMM population.
Table 12. Supported RDIMM population per channel
DIMMs slots
per channel
DIMMs installed
in each channel DIMM type DIMM speed
Ranks per
DIMM (any
combination)
3 1 Registered
DDR3 ECC
1066, 1333 single-rank,
dual-rank
Chapter 5. Removing and replacing server components 171
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