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A minimum of four CDIMM slots must be populated for each installed processor module. For a
Power E850C with two processor modules, eight CDIMM slots must be populated. For a
Power E850C with three processor modules installed, 12 CDIMM slots must be populated,
and for a Power E850C with four processor modules installed, 16 CDIMM slots must be
populated.
All the memory CDIMMs are capable of capacity upgrade on demand and must have a
minimum of 50% of its physical capacity activated. For example, if a Power E850C has
512 GB of memory installed, a minimum of 256 GB would need to be activated. A minimum of
128 GB of memory must be activated on each system. For more information about Capacity
on Demand and activation requirements, see 2.6, "Capacity on Demand" on page 40.
For the Power E850C, the following memory options are orderable:
16 GB CDIMM, 1600 MHz DDR4 DRAM (#EM8P)
32 GB CDIMM, 1600 MHz DDR4 DRAM (#EM8Q)
64 GB CDIMM, 1600 MHz DDR4 DRAM (#EM8R)
128 GB CDIMM, 1600 MHz DDR4 DRAM (#EM8S)
Note: DDR4 DRAMs provide the same memory throughput as DDR3.
Table 2-3 summarizes the minimum and maximum CDIMM and memory requirements for the
Power E850C server.
Table 2-3 Minimum and maximum memory requirements
Number of
processor
modules installed
Two
Three
Four
The following are the basic rules for memory placement:
Each feature code provides a single memory CDIMM.
Memory CDIMMs must be ordered and installed in matching pairs.
For each installed processor, there must be at least four CDIMMs populated.
There is a maximum of eight memory CDIMMs per installed processor.
At least 50% of the installed memory must be activated by using memory activation
features.
DDR4 memory modules cannot be mixed with DDR3. If a DDR4 feature is used, all the
memory on the system must be DDR4.
32
IBM Power System E850C: Technical Overview and Introduction
Minimum
Minimum
number of
memory capacity
CDIMMs
(16 GB CDIMMs)
8
128 GB
12
192 GB
16
256 GB
Maximum
Maximum
number of
memory capacity
CDIMMs
(128 GB CDIMMs)
16
2048 GB (2 TB)
24
3072 GB (3 TB)
32
4096 GB (4 TB)
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