12800 = 12.8 GBps (PC3-1600 SDRAMs, 8-byte primary data bus)
m is the DIMM type
E = Unbuffered DIMM (UDIMM) with ECC (x72-bit module data bus)
R = Registered DIMM (RDIMM)
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).
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.
v The following table lists the supported UDIMM population.
Table 14. 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,
1600
Single-rank,
dual-rank
2 2 Unbuffered
DDR3 ECC
1066, 1333,
1600
Single-rank,
dual-rank
v The following table lists the maximum DIMM population using ranked UDIMMs.
Table 15. 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
v The following table shows the UDIMM memory population rule to optimize the
system performance.
Table 16. UDIMM population rule
DIMM connector 1 DIMM connector 2 DIMM connector 3 DIMM connector 4
Populated Empty Empty Empty
204 IBM System x3100 M4 Type 2582: Problem Determination and Service Guide
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