If you have other devices to install or remove, do so now. Otherwise, go to
“Completing the memory expansion module installation” on page 90.
Installing DIMMs in the memory expansion module
The following notes describe the types of DIMMs that the memory expansion
module supports and other information that you must consider when you install
DIMMs.
v To confirm that the memory expansion module supports the DIMMs that you
are installing, see http://www.ibm.com/systems/info/x86servers/
serverproven/compat/us/.
v The memory expansion module supports a maximum of 32 DIMMs (single-rank,
dual-rank, or quad-rank).
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 PC3-xxxxx-xx-xx-xxx. The
numeral in the sixth numerical position indicates whether the DIMM is
single-rank (n=1) or dual-rank (n=2).
v The DIMM options that are available for the memory expansion module are 2
GB, 4 GB, 8 GB, and 16 GB (when available).
v The memory expansion module supports a minimum of 4 GB and a maximum
of 512 GB of system memory.
v The memory expansion module supports 1.35 V (low-voltage) and 1.5 V DIMMs.
In addition, support is dependent on the host server machine type that the
memory expansion module is connected to, as follows:
– When connecting the memory expansion module to Machine Types 7145 and
7146, install only 1.5 V DIMMs in the memory expansion module
– When connecting the memory expansion module to Machine Types 7143 and
7191:
- The memory expansion module supports low-voltage (1.35 V) DIMMs at
capacities of 4 GB, 8 GB, and 16 GB only.
- When you mix 1.35 V and 1.5 V DIMMs in the memory expansion module,
the memory expansion module operates at the 1.5 V rate.
- You can enable all DIMMs (1.35 V and 1.5 V) to operate at 1.5 V in the host
server Setup utility.
v Some memory expansion modules come with the Intel 7500 scalable memory
buffer memory card or the Intel 7510 scalable memory buffer memory card. See
the parts listing table for the memory expansion module in the Problem
Determination and Service Guide for information about the Intel memory buffer
memory card that is supported on the memory expansion module system-board
tray.
v Double-device data correction support is only available when 16 GB x4 DRAM
technology DIMMs are installed in the memory expansion module and the
memory expansion module is connected to a host server.
v The memory expansion module supports memory sparing through the host
server. Memory sparing reserves memory capacity for failover in the event of a
DIMM failure, and the reserved capacity is subtracted from the total available
memory. Memory sparing provides less redundancy than memory mirroring
does. If a predetermined threshold of correctable errors is reached, the contents
of the failing DIMM are copied to the spare memory, and the failing DIMM or
rank is disabled. To enable memory sparing through the Setup utility, select
System Settings > Memory.
Chapter 2. Installing optional devices 83
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