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Unbuffered DIMMs (UDIMMs)
The following notes provide information that you must configure when you install UDIMMs:
v The memory channels run at the fastest common frequency of the DIMMs installed.
v Do not use both UDIMMs and RDIMMs in the same server.
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 (when available)
DIMMs.
v You can install a maximum of 16 GB of memory in some server models when you use UDIMMs.
v The server supports up to two single-rank or dual-rank UDIMMs per channel.
v DIMM slots 3 and 6 are not supported when you install UDIMMs in the server. Do not install DIMMs
in these connectors.
v 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
v 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
v 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:
v The memory channels run at the fastest common frequency of the installed DIMMs.
v RDIMMs are supported in models with an Xeon 3400 series processor.
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)
DIMMs.
v You can install a maximum of 32 GB of memory in the server when you use RDIMMs.
Chapter 6. Replacing FRUs 123