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The following sections provide additional information specific to unbuffered and
registered DIMMs that you must consider.
Unbuffered DIMMs (UDIMMs)
The following notes provide information that you must consider when you install
UDIMMs:
v The memory channels run at the fastest common frequency of the installed
v Do not use both UDIMMs and RDIMMs in the same server.
v Using ECC and non-ECC UDIMMs in the server will cause the server to run in
v The UDIMM options that are available for the server are 1 GB, 2 GB, and 4 GB
v You can install a maximum of 16 GB of memory in some server models when
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.
v The following table lists the DIMM support compatibility.
v The following table lists the supported UDIMM population.
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System x3200 M3 Types 7327 and 7328: Installation and User's Guide
U = Unbuffered DIMM with no ECC (x64-bit primary data bus)
aa is the CAS latency, in clocks at maximum operating frequency
bb is the JEDEC SPD Revision Encoding and Additions level
cc is the reference design file for the design of the DIMM
d is the revision number of the reference design of the DIMM
Note: To determine the type of a DIMM, see the label on the DIMM. The
information on the label is in the format xxxxx nRxxx PC3-xxxxx-xx-xx-xxx. The
numeral in the sixth numerical position indicates whether the DIMM is single-rank
(n=1) or dual-rank (n=2).
DIMMs.
non-ECC mode.
(when available) memory DIMMs.
you use UDIMMs.
Do not install DIMMs in these connectors.
Table 3. 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 4. Supported UDIMM population per channel
DIMMs slots
DIMMs installed
per channel
in each channel DIMM type
2
1
2
2
Intel dual-core (Core
i3)
Not supported
Supported
Not supported
Not supported
DIMM speed
Unbuffered
1066, 1333
DDR3 ECC
Unbuffered
1066, 1333
DDR3 ECC
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
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