IBM System x3650 M4 BD Type 5466 Installation And Service Manual page 77

v The server supports 1.35-volt (low-voltage) and 1.5-volt DIMMs.
v The server supports a maximum of 16 DIMMs (single-rank and dual-rank) on
the base system board.
v The DIMM options that are available for the server are 4 GB, 8 GB, 16 GB, and
32 GB (when available).
v The server supports memory sparing. Memory sparing reserves memory
capacity for failover in the event of a DIMM failure, and the reserved capacity is
deducted 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.
v The server system board supports a minimum of 4 GB and a maximum of 512
GB of system memory.
Note: The amount of usable memory is reduced depending on the system
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
"Configuring the server" on page 88.
v The following table shows the DIMM connectors that are associated with each
microprocessor:
Table 5. DIMM connectors associated with each microprocessor
Microprocessor
Microprocessor 1
Microprocessor 2
v When you replace a DIMM, the server provides automatic DIMM enablement
capability without you having to go to Setup to enable the new DIMM
manually.
v The maximum operating speed of the server is determined by the slowest
DIMM installed in the server.
v A minimum of one DIMM must be installed for each microprocessor. For
example, you must install a minimum of two DIMMs if the server has two
microprocessors installed.
v The server comes with a minimum of one DIMM installed in slot 1. When you
install additional DIMMs, install them in the order shown in the information in
the following tables to optimize system performance.
v The server supports independent mode, rank sparing mode, and mirroring
mode.
DIMM connectors associated with the
microprocessor
1 through 8
9 through 16
Chapter 2. Installing optional devices
61