Lenovo x3550 M4 Installation And Service Manual page 249
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speed is set to Max performance and LV-DIMM power is set to Enhance
performance mode. The 1.35 V UDIMMs, RDIMMs or LRDIMMs will
function at 1.5 V.
v The server supports a maximum of 16 dual-rank UDIMMs. The server supports
up to two UDIMMs per channel.
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 20. Maximum memory installation using ranked DIMMs
Number of
DIMMs
DIMM type
16
Dual-rank UDIMM
24
Single-rank RDIMM
24
Single-rank RDIMM
24
Dual-rank RDIMM
24
Dual-rank RDIMM
24
Dual-rank RDIMM
16
Quad-rank RDIMM
24
Quad-rank LRDIMM
v The UDIMM option that is available for the server is 4 GB. The server supports
a minimum of 4 GB and a maximum of 64 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
"Configuring the server" on page 98.
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.
Notes:
1. 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.
DIMM size
4 GB
2 GB
4 GB
4 GB
8 GB
16 GB
8 GB
32 GB
Chapter 6. Removing and replacing components
Total memory
64 GB
48 GB
96 GB
96 GB
192 GB
384 GB
128 GB
768 GB
231
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