IBM x3250 M3 Problem Determination And Service Manual page 172

v The following table lists the supported UDIMM population.
v The following table lists the maximum DIMM population using ranked UDIMMs.
v The following table shows the UDIMM memory population rule to optimize the
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
v RDIMMs are supported in models with an Intel 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
v The RDIMM options that are available for the server are 1 GB, 2 GB, 4 GB, and
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IBM System x3250 M3 Types 4251, 4252, and 4261: Problem Determination and Service Guide
Table 8. Supported DIMM compatibility
Intel quad-core
DIMM configuration (Xeon 3400 series)
UDIMM non-ECC Not supported
only
UDIMM ECC only Supported
UDIMM mix ECC with Not supported
non-ECC
RDIMM ECC only Supported
Table 9. Supported UDIMM population per channel
DIMM
connectors per DIMMs installed
channel in each channel DIMM type
2 1
2 2
Table 10. Maximum memory population using ranked UDIMMs (depending on your model)
Number of UDIMMs DIMM type
4 Single-rank UDIMMs
4 Dual-rank UDIMMs
4 Dual-rank UDIMMs
system performance.
Table 11. UDIMM population rule for dual-channel symmetric mode
DIMM DIMM
connector 1 connector 2
Populated Empty
Populated Empty
Populated Populated
DIMMs.
channel.
8 GB DIMMs.
Intel dual-core (Core
i3)
Not supported
Supported
Not supported
Not supported
DIMM speed
Unbuffered 1066, 1333
DDR3 ECC
Unbuffered 1066, 1333
DDR3 ECC
Size
1 GB
2 GB
4 GB
DIMM DIMM
connector 3 connector 4
Empty Empty
Empty Populated
Empty Populated
Intel dual-core
(Xeon L3406)
Not supported
Supported
Not supported
Not supported
Ranks per
DIMM (any
combination)
Single-rank,
dual-rank
Single-rank,
dual-rank
Total memory
4 GB
8 GB
16 GB
DIMM DIMM
connector 5 connector 6
Empty Empty
Empty Empty
Populated Empty