IBM System x3250 M3 Type 4251 Installation And User Manual page 45

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
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
v The following table lists the supported UDIMM population.
Table 5. Supported UDIMM population per channel
DIMM
connectors per DIMMs installed
channel in each channel DIMM type
2 1
2 2
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
4 Single-rank UDIMMs
4 Dual-rank UDIMMs
4 Dual-rank UDIMMs
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 DIMM
connector 1 connector 2
Populated Empty
Populated Empty
Populated Populated
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
Chapter 2. Installing optional devices
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
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