Chapter 4. IBM NeXtScale nx360 M4 compute node 73
The following memory protection technologies are supported:
ECC
Chipkill (for x4-based memory DIMMs; look for “x4” in the DIMM description;
for x8-based memory DIMMs, only ECC protection is supported)
Memory mirroring mode
Memory lock-step mode
When mirrored mode is used, DIMM 1 and DIMM 2 hold the same data for
redundancy purposes. If one DIMM fails, it is disabled and the backup DIMM in
the other channel takes over. Likewise, DIMM 3 and DIMM 4 hold the same data
and create a mirrored pair. Because memory mirroring is handled in hardware, it
is operating system-independent. The total usable memory size is half the total of
the installed memory.
Lock-step mode requires paired memory channels (DIMM 1 and DIMM 2,
DIMM 3 and DIMM 4) to be populated by the same memory regards the size and
the organization. Lock-step mode allows Single Device Data Correction (SDDC)
memory protection for x8-based memory DIMMs.
4.6.1 DIMM installation order
The IBM NeXtScale nx360 M4 boots with only one memory DIMM installed per
processor. However, the suggested memory configuration is to balance the
memory across all the memory channels on each processor to use the available
memory bandwidth. For best performance, it is recommended to populate all
DIMM slots.
00D5036 A3QH 8GB (1x8GB, 1Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
8-
00D5044 A3QK 8GB (1x8 GB, 2Rx8, 1.35 V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
8-
46W0672 A3QM 16GB (1x16GB, 2Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
8-
LRDIMMs
46W0761 A47K 32GB (1x32GB, 4Rx4, 1.5V) PC3-14900
CL13 ECC DDR3 1866MHz LP LRDIMM
8-
Part
number
Feature
code
Description Maximum
supported
Models
where used
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