IBM X3950 X5 Problem Determination And Service Manual page 202

7. If you are instructed to return the DIMM, follow all packaging instructions, and
Replacing a memory expansion module DIMM
This topic provides information about the types of DIMMs, as well as instructions
for how to replace a memory expansion module DIMM.
About this task
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 The memory expansion module supports a maximum of 32 DIMMs (single-rank,
v The DIMM options that are available for the memory expansion module are 2
v If you install 32 GB DIMMs in the memory expansion module, all of the DIMMs
v The memory expansion module supports a minimum of 4 GB and a maximum
v The memory expansion module supports 1.35-volt (low-voltage) and 1.5-volt
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IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Problem Determination and Service Guide
use any packaging materials for shipping that are supplied to you.
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).
GB, 4 GB, 8 GB, 16 GB, and 32 GB.
must be 32 GB capacity DIMMs. You cannot mix 32 GB DIMMs with other
capacity DIMMs in the system.
of 1 TB of system memory.
DIMMs. In addition:
– The memory expansion module supports low-voltage (1.35-volt) DIMMs at
capacities of 4 GB, 8 GB, and 16 GB only.
– When you mix 1.35-volt and 1.5-volt DIMMs in the memory expansion
module, it will operate at the 1.5-volt rate.
– You can enable all the DIMMs (1.35-volt and 1.5-volt) to operate at 1.5-volt in
the Setup utility through the host server.