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
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 DIMM support compatibility.
Table 4. Supported DIMM compatibility
DIMM configuration
Intel quad-core
(Xeon 3400 series)
Intel dual-core (Core
i3)
Intel dual-core
(Xeon L3406)
UDIMM non-ECC
only
Not supported Not supported Not supported
UDIMM ECC only Supported Supported Supported
UDIMM mix ECC with
non-ECC
Not supported Not supported Not supported
RDIMM ECC only Supported Not supported Not supported
v The following table lists the supported UDIMM population.
Table 5. 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 6. 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
v The following table shows the UDIMM memory population rule to optimize the
system performance.
Table 7. 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
32 IBM System x3250 M3 Types 4251, 4252, and 4261: Installation and User’s Guide
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