Lenovo System x3650 M4 Installation And Service Manual page 280

– 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).
• 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
• 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.
• In two-DIMM-per-channel configuration, a server with an Intel Xeon™ E5-2600 series microprocessor
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.
• The server supports a maximum of 16 dual-rank UDIMMs. The server supports up to two UDIMMs
per channel.
• 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.
• The following table shows an example of the maximum amount of memory that you can install using
ranked DIMMs:
Table 27. Maximum memory installation using ranked DIMMs
Number of DIMMs
16
24
24
24
24
24
24
16
24
• 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.
• The RDIMM options that are available for the server are 2 GB, 4 GB, 8 GB, and 16 GB. The server
supports a minimum of 2 GB and a maximum of 384 GB of system memory using RDIMMs.
• The HCDIMM options that are available for the server are 16 GB and 32 GB. The server supports a
minimum of 16 GB and a maximum of 768 GB of system memory using HCDIMMs.
268
Lenovo System x3650 M4 Installation and Service Guide
DIMM type
Dual-rank UDIMMs
Single-rank RDIMMs
Single-rank RDIMMs
Dual-rank RDIMMs
Dual-rank RDIMMs
HCDIMMs
HCDIMMs
Quad-rank RDIMMs
Quad-rank LRDIMMs
DIMM size
4 GB
2 GB
4 GB
8 GB
16 GB
16 GB
32 GB
8 GB
32 GB
Total memory
64 GB
48 GB
96 GB
192 GB
384 GB
384 GB
768 GB
128 GB
768 GB