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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 server supports up to two UDIMMs or three RDIMMs per channel. The following table shows an
example of the maximum amount of memory that you can install, using ranked DIMMs.
Unbuffered DIMMs (UDIMMs)
The following notes provide information that you must congure when you install UDIMMs:
• The memory channels run at the fastest common frequency of the DIMMs installed.
• Do not use both UDIMMs and RDIMMs in the same server.
• Using ECC and non-ECC UDIMMs in the server will cause the server to run in non-ECC mode.
• The UDIMM options that are available for the server are 1 GB, 2 GB, and 4 GB (when available) DIMMs.
• You can install a maximum of 16 GB of memory in some server models when you use UDIMMs.
• The server supports up to two single-rank or dual-rank UDIMMs per channel.
• DIMM slots 3 and 6 are not supported when you install UDIMMs in the server. Do not install DIMMs in
these connectors.
• The following table lists the supported UDIMM population.
Table 8. Supported UDIMM population per channel
DIMM connectors
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
• The following table lists the maximum DIMM population using ranked UDIMMs.
Table 9. Maximum memory population using ranked UDIMMs (depending on your model)
Number of UDIMMs DIMM type 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
• The following table shows the UDIMM memory population rule to optimize the system performance.
Table 10. UDIMM population rule for dual-channel symmetric mode
DIMM
connector 1
DIMM
connector 2
DIMM
connector 3
DIMM
connector 4
DIMM
connector 5
DIMM
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:
Chapter 6. Replacing FRUs 123