Lenovo 653417U Installation And User Manual page 49

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 both 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 6. Supported UDIMM population per channel
DIMM connectors DIMMs installed in
per channel each channel
2 1
2 2
v The following table lists the maximum DIMM population using ranked UDIMMs.
Table 7. Maximum memory population using ranked UDIMMs (depending on your model)
Number of UDIMMs
4
4
4
4
v The following table shows the UDIMM memory population rule to optimize the system performance.
Table 8. UDIMM population rule for dual-channel symmetric mode
DIMM connector DIMM connector
1 2
Populated Empty
Populated Empty
Populated Populated
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.
DIMM type
Unbuffered DDR3
ECC
Unbuffered DDR3
ECC
DIMM type
Single-rank UDIMMs
Single-rank UDIMMs
Dual-rank UDIMMs
Dual-rank UDIMMs
DIMM connector
3
Empty
Empty
Empty
DIMM speed
1066, 1333
1066, 1333
Size
1 GB
2 GB
2 GB
4 GB (when available)
DIMM connector DIMM connector
4 5
Empty Empty
Populated Empty
Populated Populated
Chapter 5. Installing and replacing optional devices
Ranks per DIMM
(any combination)
Single-rank,
dual-rank
Single-rank,
dual-rank
Total memory
4 GB
8 GB
8 GB
16 GB
DIMM connector
6
Empty
Empty
Empty
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