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v The server supports 1 GB, 2 GB, 4 GB, 8 GB, and 16 GB DIMMs, with a
minimum of 1 GB and a maximum of 192 GB of system memory.
For 32-bit operating systems only: Some memory is reserved for various
system resources and is unavailable to the operating system. The amount of
memory that is reserved for system resources depends on the operating system,
the configuration of the server, and the configured PCI devices.
Note: If you install a ServeRAID-M1015 SAS/SATA adapter, make sure at least 2
GB of memory is installed in the server before you run DSA from a bootable CD.
v The maximum operating speed of the server is determined by the slowest DIMM
in the server.
v The server can operate in three modes: sparing, mirroring and independent
channel modes.
Note: Memory sparing is only available for Intel Xeon 5600 series
microprocessor.
In two-DIMM-per-channel configuration, a server with an Intel Xeon X5600 series
microprocessor automatically operates with a maximum memory speed of up to
1333 MHz when one of the following conditions is met:
v Two 1.5 V single-rank or dual-rank RDIMMs are installed in the same channel. In
the Setup utility, Memory speed is set to Max performance mode
v Two 1.35 V single-rank or dual-ranl RDIMMs 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 RDIMMs will function
at 1.5 V
The following notes describe the types of DIMMs that the server supports and other
information that you must consider when you install DIMMs.
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), 800,
1066, or 1333 MHz, PC3-10600R-999, 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.
– The specifications of a DDR3 DIMM are on a label on the DIMM, in the
following 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
Chapter 2. Installing optional devices
87
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