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• The memory channels run at the fastest common frequency of the installed DIMMs.
• RDIMMs are supported in models with an Xeon 3400 series processor.
• Do not use both RDIMMs and UDIMMs in the same server.
• The server supports up to three single-rank, dual-rank, or quad-rank RDIMMs per channel.
• The RDIMM options that are available for the server are 1 GB, 2 GB, 4 GB, and 8 GB (when available)
DIMMs.
• You can install a maximum of 32 GB of memory in the server when you use RDIMMs.
• The following table lists the supported RDIMM population.
Table 11. Supported RDIMM population per channel
DIMM connectors
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
3 2 Registered DDR3
ECC
1066, 1333
Single-rank,
dual-rank
3 3 Registered DDR3
ECC
800
Single-rank,
dual-rank
3 1 Registered DDR3
ECC
1066
Quad-rank
3 2 Registered DDR3
ECC
800
Quad-rank
• The following table lists the maximum DIMM population using ranked RDIMMs.
Table 12. Maximum memory population using ranked RDIMMs (depending on your model)
Number of RDIMMs DIMM type Size Total memory
6
Single-rank RDIMMs 1 GB 6 GB
6
Single-rank RDIMMs 2 GB 12 GB
6 Dual-rank RDIMMs
2 GB 12 GB
4 Dual-rank RDIMMs
4 GB 16 GB
4
Quad-rank RDIMMs 4 GB 16 GB
6 Dual-rank RDIMMs
4 GB 24 GB
4
Quad-rank RDIMMs 8 GB (when available) 32 GB
• The following table shows the RDIMM memory population rule to optimize the system performance.
Table 13. RDIMM 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
Populated Populated Populated Populated Populated Populated
124 Hardware Maintenance Manual