– Do not install registered, unbuffered, and load reduction DIMMs in the same
server
v The maximum memory speed is determined by the combination of the
microprocessor, DIMM speed, DIMM type, Operating Modes in UEFI settings,
and the number of DIMMs installed in each channel.
v In two-DIMM-per-channel configuration, a server with an Intel Xeon
™
E5-2600
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.
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 14. Maximum memory installation using ranked DIMMs
Number of
DIMMs DIMM type DIMM size Total memory
16 Dual-rank UDIMMs 4 GB 64 GB
24 Single-rank RDIMMs 2 GB 48 GB
24 Single-rank RDIMMs 4 GB 96 GB
24 Dual-rank RDIMMs 8 GB 192 GB
24 Dual-rank RDIMMs 16 GB 384 GB
24 Quad-rank HCDIMMs 32 GB 768 GB
16 Quad-rank RDIMMs 16 GB 256 GB
24 Quad-rank LRDIMMs 32 GB 768 GB
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 HCDIMM options that are available for the server are 16 GB and 32 GB.
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.
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
252 IBM System x3650 M4 Type 7915: Problem Determination and Service Guide
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