- 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 PC3v-xxxxxx-xx-xx-xxx.
The numeral in the sixth numerical position indicates whether the DIMM is
single-rank (n=1), dual-rank (n=2), or quad-rank (n=4).
v The following rules apply to DDR3 RDIMM speed as it relates to the number of
RDIMMs in a channel:
– When you install 1 RDIMM per channel, the memory runs at 1866 MHz
– When you install 2 RDIMMs per channel, the memory runs at 1600 MHz
– When you install 3 RDIMMs per channel, the memory runs at 1066 MHz
– All channels in a server run at the fastest common frequency
– Do not install registered, unbuffered, and load reduction DIMMs in the same
server
v The maximum memory speed is determined by the combination of the
microprocessor, DIMM speed, DIMM type, Operating Modes in UEFI settings,
and the number of DIMMs installed in each channel.
v In two-DIMM-per-channel configuration, the server automatically operates with
a maximum memory speed of up to 1600 MHz when the following condition is
met:
– Two 1.35 V single-rank, dual-ranl, or quad-rank UDIMMs, RDIMMs or
LRDIMMs are installed in the same channel. In the Setup utility, Memory
speed is set to Max performance and LV-DIMM power is set to Enhance
performance mode. The 1.35 V UDIMMs, RDIMMs or LRDIMMs will
function at 1.5 V.
v The server supports a maximum of 16 dual-rank UDIMMs. The server supports
up to two UDIMMs per channel.
v The server supports a maximum of 24 single-rank, dual-rank, or 16 quad-rank
RDIMMs. The server does not support three quad-rank RDIMMs in the same
channel.
v The following table shows an example of the maximum amount of memory that
you can install using ranked DIMMs:
Table 20. Maximum memory installation using ranked DIMMs
Number of
DIMMs DIMM type DIMM size Total memory
16 Dual-rank UDIMM 4 GB 64 GB
24 Single-rank RDIMM 2 GB 48 GB
24 Single-rank RDIMM 4 GB 96 GB
24 Dual-rank RDIMM 4 GB 96 GB
24 Dual-rank RDIMM 8 GB 192 GB
24 Dual-rank RDIMM 16 GB 384 GB
16 Quad-rank RDIMM 8 GB 128 GB
24 Quad-rank LRDIMM 32 GB 768 GB
v The UDIMM option that is available for the server is 4 GB. The server supports
a minimum of 4 GB and a maximum of 64 GB of system memory using
UDIMMs.
238 IBM System x3550 M4 Type 7914: Installation and Service Guide
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