Table 10. Memory Speeds and Configurations – Minimum Power (continued)
DIMM by
rank, type,
technology
FRU
number
DIMM
capacity Speed (MHz) and Voltage Supported by DPC
QR x4
LR-DIMM
– 2Gb (1333
MHz)
49Y1569 16 GB 800 800 800
QR x4
LR-DIMM
– 4Gb (1333
MHz)
90Y3107 32 GB 800 800 800
The memory is accessed internally through 16 channels (four channels for each
microprocessor). Each channel contains three DIMM connectors. Each channel can
have a maximum of eight ranks. The following table lists each channel and shows
which DIMM connectors are in the channel.
Table 11. Memory-channel configuration
Microprocessor Memory channel DIMM connectors
Microprocessor 1
Channel 1 1, 2, and 3
Channel 0 4, 5, and 6
Channel 2 7, 8, and 9
Channel 3 10, 11, and 12
Microprocessor 2
Channel 1 13, 14, and 15
Channel 0 16, 17, and 18
Channel 2 19, 20, and 21
Channel 3 22, 23, and 14
Microprocessor 3
Channel 2 25, 26, and 27
Channel 3 28, 29, and 30
Channel 1 31, 32, and 33
Channel 0 34, 35, and 36
Microprocessor 4
Channel 2 37, 38, and 39
Channel 3 40, 41, and 42
Channel 1 43, 44, and 45
Channel 0 46, 47, and 48
The following notes describe information that you must consider when you install
memory:
v You cannot mix RDIMMs and LRDIMMs in the same compute node.
v A total of eight ranks on each channel is supported.
v If a quad-rank DIMM is installed, install it in the connector at the end of the
memory channel.
v If a channel has one or more quad-rank RDIMMs, only two DIMMs per channel
is supported. The quad-rank, eight rank per channel limitation only applies to
RDIMMs. Quad-rank LRDIMMs can be installed at three DIMMs per channel
since the processor recognizes LRDIMMs as dual-rank DIMMs.
Chapter 7. Installing, removing, and replacing compute node components 507
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