cc is the reference design file for the design of the DIMM
Note: To determine the type of a DIMM, see the label on the DIMM. The
information on the label is in the format xxxxx nRxxx PC3-xxxxx-xx-xx-xxx. The
numeral in the sixth numerical position indicates whether the DIMM is single-rank
(n=1) or dual-rank (n=2).
The following sections provide additional information specific to unbuffered DIMMs
that you must consider.
Unbuffered DIMMs (UDIMMs)
The following notes provide information that you must consider when you install
UDIMMs:
v The memory channels run at the fastest common frequency of the installed
DIMMs.
v Using ECC and non-ECC UDIMMs in the server will cause the server to run in
non-ECC mode.
v The UDIMM options that are available for the server are 1 GB, 2 GB, and 4 GB
memory DIMMs.
v You can install a maximum of 16 GB of memory in the server.
v The server supports up to two single-rank or dual-rank UDIMMs per channel.
v The following table lists the supported UDIMM population.
Table 3. 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 4. 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 16 GB
Chapter 2. Installing optional devices 29
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