IBM Flex System x440 Compute Node Installation And Service Manual page 519

Table 10. Memory Speeds and Configurations – Minimum Power (continued)
DIMM by
rank, type, FRU DIMM
technology number capacity
QR x4 49Y1569 16 GB
LR-DIMM
– 2Gb (1333
MHz)
QR x4 90Y3107 32 GB
LR-DIMM
– 4Gb (1333
MHz)
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
Microprocessor 1
Microprocessor 2
Microprocessor 3
Microprocessor 4
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
Speed (MHz) and Voltage Supported by DPC
800 800
800 800
Memory channel
Channel 1
Channel 0
Channel 2
Channel 3
Channel 1
Channel 0
Channel 2
Channel 3
Channel 2
Channel 3
Channel 1
Channel 0
Channel 2
Channel 3
Channel 1
Channel 0
800
800
DIMM connectors
1, 2, and 3
4, 5, and 6
7, 8, and 9
10, 11, and 12
13, 14, and 15
16, 17, and 18
19, 20, and 21
22, 23, and 14
25, 26, and 27
28, 29, and 30
31, 32, and 33
34, 35, and 36
37, 38, and 39
40, 41, and 42
43, 44, and 45
46, 47, and 48
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