IBM System x3500 Installation And User Manual page 97

v The server supports a maximum of 24 single-rank, dual-rank, or 16 quad-rank
RDIMMs. The server does not support three quad-rank RDIMMs in the same
channel.
v The following table shows an example of the maximum amount of memory that
you can install using ranked DIMMs:
Table 5. Maximum memory installation using ranked DIMMs
Number of
DIMMs DIMM type
16 Single-rank UDIMMs
24 Single-rank RDIMMs
24 Single-rank RDIMMs
24 Dual-rank RDIMMs
24 Dual-rank RDIMMs
16 Quad-rank RDIMMs
24 Quad-rank LRDIMMs
v The UDIMM option that is available for the server is 2 GB. The server supports a
minimum of 2GB and a maximum of 32 GB of system memory using UDIMMs.
v The RDIMM options that are available for the server are 2 GB, 4 GB, 8 GB, and
16 GB. The server supports a minimum of 2 GB and a maximum of 384 GB of
system memory using RDIMMs.
v The LRDIMM option that is available for the server is 32 GB. The server supports
a minimum of 32 GB and a maximum of 768 GB of system memory using
LRDIMMs.
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
Chapter 3, "Configuring the server," on page 117.
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. However, to improve system performance, install a
minimum of four DIMMs for each microprocessor.
v DIMMs in the server must be the same type (RDIMM, UDIMM, or LRDIMM) to
ensure that the server will operate correctly.
v When you install one quad-rank DIMM in a channel, install it in the DIMM
connector furthest away from the microprocessor.
v For UDIMMs, DIMM connectors 3, 6, 7, and 10 for microprocessor 1 and DIMM
connectors 15, 18, 19, and 22 for microprocessor 2 are not used.
Note: You can install DIMMs for microprocessor 2 as soon as you install
microprocessor 2; you do not have to wait until all of the DIMM slots for
microprocessor 1 are filled.
The following illustration shows the location of the DIMM connectors on the system
board.
DIMM size Total memory
2 GB 32 GB
2 GB 48 GB
4 GB 96 GB
8 GB 192 GB
16 GB 384 GB
16 GB 256 GB
32 GB 768 GB
Chapter 2. Installing optional devices
79