IBM NeXtScale System Planning And Implementation Manual page 90

The following rules apply when you select the memory configuration:
Each installed processor must have at least one memory DIMM connected.
In the nx360 M4, the maximum memory speed of a configuration is the lower
of the following two values:
– The memory speed of the processor (see Table 4-4 on page 70)
– The memory speed of the DIMM (see Table 4-10 on page 76)
The server supports 1.5 V and 1.35 V DIMMs. Mixing 1.5 V and 1.35 V
DIMMs in the same server is supported. In such a case, all DIMMs operate at
1.5 V.
Mixing UDIMMs and RDIMMs is not supported.
Equally distribute DIMMs between sockets for best performance.
For optimal performance, populate the four memory channels when one
processor is installed and the eight DIMMs when two processors are
installed.
Table 4-5 lists the memory options that are available for the nx360 M4 server.
Table 4-5 Table 5. Memory options
Part Feature
number code
UDIMMs
00D5012 A3QB
RDIMMs - 1866 MHz
00D5028 A3QF
00D5040 A3QJ
00D5048 A3QL
RDIMMs - 1600 MHz
00D5024 A3QE
46W0735 A3ZD
72
IBM NeXtScale System Planning and Implementation Guide
Description
4GB (1x4 GB, 2Rx8, 1.35 V) PC3L-12800
CL11 ECC DDR3 1600MHz LP UDIMM
4GB (1x4 GB, 2Rx8, 1.5 V) PC3-14900
CL13 ECC DDR3 1866MHz LP RDIMM
8GB (1x8 GB, 2Rx8, 1.5 V) PC3-14900
CL13 ECC DDR3 1866MHz LP RDIMM
16GB (1x16 GB, 2Rx4, 1.5 V) PC3-14900
CL13 ECC DDR3 1866MHz LP RDIMM
4GB (1x4GB, 1Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
4GB (1x4 GB, 2Rx8, 1.35 V) PC3-12800
CL13 ECC DDR3 1600MHz LP RDIMM
Maximum Models
supported where used
8 -
8 -
8 42x, 62x
8 -
8 -
8 22x