Memory module installation
The following notes describe the types of dual inline memory modules (DIMMs)
that the server supports and other information that you must consider when you
install DIMMs.
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v Confirm that the server supports the DIMM that you are installing, see
http://www.ibm.com/systems/info/x86servers/serverproven/compat/us/.
v When you install or remove DIMMs, the server configuration information
changes. When you restart the server, the system displays a message that
indicates that the memory configuration has changed.
v The server supports only industry-standard double-data-rate 3 (DDR3) - 1600 or
1866 MHz (depending on the configuration) , synchronous dynamic
random-access memory (SDRAM) registered dual inline memory modules
(DIMMs) with error correcting code (ECC).
v The specifications of a DDR3 DIMM are on a label on the DIMM, in the
following format.
ggg eRxff-PC3-wwwwwm-aa-bb-cc-dd
where:
– ggg is the total capacity of the DIMM (for example, 1GB, 2GB, or 4GB)
– eis the number of ranks
1 = single-rank
2 = dual-rank
–xff is the device organization or bit width (for example, x4, x8, or x16)
4 = x4 organization (4 DQ lines per SDRAM)
8 = x8 organization
16 = x16 organization
– wwwww is the DIMM bandwidth, in MBps
12800 = 12.80 GBps PC3-1600 SDRAMs, 8-byte primary data bus)
14900 = 14.93 GBps PC3-1866 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)
L = Load Reduction DIMM (LR-DIMM)
– aa is the DDR3 SDRAM 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 xxx nRxxx PC3-xxxxx-xx-xx-xx-xx. The
numeral in the fourth numerical position indicates whether the DIMM is
single-rank (n=1) or dual-rank (n=2).
v Do not mix registered and unbuffered DIMMs in the server.
v Do not mix load reduced DIMMs with other types of DIMMs in the server.
v DO not mix ECC and non-ECC DIMMs in the server.
60 System x3650 M4 BD Type 5466: Installation and Service Guide
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