IBM x3100 M5 Type 5457

Unbuffered DIMMs (UDIMMs):
The following notes provide information that you must consider when you install
UDIMMs:
v The memory channels run at the lowest common frequency of the DIMMs
installed.
v The UDIMM options that are available for the server are 1 GB, 2 GB, 4 GB, and
8 GB (when available) DIMMs.
v The server supports up to two single-rank or dual-rank UDIMMs per channel.
The following table lists the supported UDIMM population.
Table 35. 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
1333, 1600 Single-rank,
dual-rank
2 2 Unbuffered
DDR3 ECC
1333, 1600 Single-rank,
dual-rank
The following table lists the maximum DIMM population using ranked UDIMMs.
Table 36. 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 Dual-rank UDIMMs 2 GB 8 GB
4 Dual-rank UDIMMs 4 GB 16 GB
4 Dual-rank UDIMMs 8 GB (when
available)
32 GB
The following table shows the UDIMM memory population rule to optimize the
system performance.
Table 37. UDIMM population rule
DIMM connector 1 DIMM connector 2 DIMM connector 3 DIMM connector 4
Populated Empty Empty Empty
Populated Empty Populated Empty
Populated Populated Populated Populated
The following illustration shows the location of the DIMM connectors on the
system board.
Note: The illustrations in this document might differ slightly from your model.
276 System x3100 M5 Type 5457: Installation and Service Guide