IBM System x3650 M4 Type 7915 Problem Determination And Service Manual page 270

v The maximum memory speed is determined by the combination of the
v In two-DIMM-per-channel configuration, a server with an Intel Xeon
v The server supports a maximum of 16 dual-rank UDIMMs. The server supports
v The server supports a maximum of 24 single-rank, dual-rank, or 16 quad-rank
v The following table shows an example of the maximum amount of memory that
v The UDIMM option that is available for the server is 4 GB. The server supports a
v The RDIMM options that are available for the server are 2 GB, 4 GB, 8 GB, and
v The HCDIMM options that are available for the server are 16 GB and 32 GB.
v The LRDIMM option that is available for the server is 32 GB. The server supports
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IBM System x3650 M4 Type 7915: Problem Determination and Service Guide
– Do not install registered, unbuffered, and load reduction DIMMs in the same
server
microprocessor, DIMM speed, DIMM type, Operating Modes in UEFI settings,
and the number of DIMMs installed in each channel.
series microprocessor automatically operates with a maximum memory speed of
up to 1600 MHz when the following condition is met:
– Two 1.35 V single-rank, dual-ranl, or quad-rank UDIMMs, RDIMMs or
LRDIMMs are installed in the same channel. In the Setup utility, Memory
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.
up to two UDIMMs per channel.
RDIMMs. The server does not support three quad-rank RDIMMs in the same
channel.
you can install using ranked DIMMs:
Table 14. Maximum memory installation using ranked DIMMs
Number of
DIMMs DIMM type
16 Dual-rank UDIMMs
24 Single-rank RDIMMs
24 Single-rank RDIMMs
24 Dual-rank RDIMMs
24 Dual-rank RDIMMs
24 Quad-rank HCDIMMs
16 Quad-rank RDIMMs
24 Quad-rank LRDIMMs
minimum of 4 GB and a maximum of 64 GB of system memory using UDIMMs.
16 GB. The server supports a minimum of 2 GB and a maximum of 384 GB of
system memory using RDIMMs.
The server supports a minimum of 16 GB and a maximum of 768 GB of system
memory using HCDIMMs.
Note: Do not mix the 16 GB HCDIMM and the 32 GB HCDIMM in the server.
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
DIMM size Total memory
4 GB 64 GB
2 GB 48 GB
4 GB 96 GB
8 GB 192 GB
16 GB 384 GB
32 GB 768 GB
16 GB 256 GB
32 GB 768 GB
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