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Installing a memory module
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 (see "System-board optional-device connectors" on page 25 for the location
of the DIMM connectors):
v The server supports only industry-standard double-data-rate 3 (DDR3), 1066 or
v The maximum amount of memory that the server supports is dependent on the
v The amount of usable memory is reduced, depending on the system
v The maximum operating speed of the server is determined by the slowest DIMM
v If you install a pair of DIMMs in DIMM connectors 2 and 5, the size and speed of
v You can use compatible DIMMs from various manufacturers in the same pair.
v When you install or remove DIMMs, the server configuration information
v The specifications of a DDR3 DIMM are on a label on the DIMM, in the following
1333 MHz, PC3-8500 or PC3-10600 (single-rank, dual-rank, or quad-rank),
registered or unbuffered, synchronous dynamic random-access memory
(SDRAM) dual inline memory modules (DIMMs) with error correcting code (ECC).
See http://www.ibm.com/servers/eserver/serverproven/compat/us/ for a list of
supported memory modules for the server.
type of memory that you install in the server. See "Unbuffered DIMMs (UDIMMs)"
on page 36 and "Registered DIMMs (RDIMMs)" on page 37 for more information.
configuration. A certain amount of memory must be reserved for system
resources. To view the total amount of installed memory and the amount of
configured memory, run the Setup utility. For additional information, see "Using
the Setup utility" on page 68.
in the server.
the DIMMs that you install in DIMM connectors 2 and 5 must match each other.
However, they do not have to be the same size and speed as the DIMMs that
are installed in DIMM connectors 1 and 4.
changes. When you restart the server, the system displays a message that
indicates that the memory configuration has changed.
format.
ggg eRxff-PC3-wwwwwm-aa-bb-cc
where:
ggg is the total capacity of the DIMM (for example, 1GB, 2GB, or 4GB)
e is the number of ranks
1 = single-rank
2 = dual-rank
4 = quad-rank
ff is the device organization (bit width)
4 = x4 organization (4 DQ lines per SDRAM)
8 = x8 organization
16 = x16 organization
wwwww is the DIMM bandwidth, in MBps
8500 = 8.53 GBps (PC3-1066 SDRAMs, 8-byte primary data bus)
10600 = 10.66 GBps (PC3-1333 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)
Chapter 2. Installing optional devices
35
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