The SR860 supports up to 12 DIMMs per processor, for a total of 48 DIMMs when four processors are
installed. Each processor has six memory channels, and supports one or two DIMMs per channel.
All DIMMs can operate at a speed of 2666 MHz, both at 1 DIMM per channel and 2 DIMMs per channel.
However, if the processor selected has a lower memory bus speed (eg 2400 MHz), then all DIMMs will
operate at that lower speed.
The following table lists the memory options that are available for the SR860 server.
Table 6. Memory options
Part
number
Feature
code Description
Maximum
supported
RDIMMs
7X77A01301 AUU1 ThinkSystem 8GB TruDDR4 2666 MHz (1Rx8 1.2V) RDIMM 48 (12 per processor)
7X77A01302 AUNB ThinkSystem 16GB TruDDR4 2666 MHz (1Rx4 1.2V) RDIMM 48 (12 per processor)
7X77A01303 AUNC ThinkSystem 16GB TruDDR4 2666 MHz (2Rx8 1.2V) RDIMM 48 (12 per processor)
7X77A01304 AUND ThinkSystem 32GB TruDDR4 2666 MHz (2Rx4 1.2V) RDIMM 48 (12 per processor)
LRDIMMs
7X77A01305 AUNE ThinkSystem 64GB TruDDR4 2666 MHz (4Rx4 1.2V) LRDIMM 48 (12 per processor)
The following rules apply when selecting the memory configuration:
The server supports RDIMMs and LRDIMMs. 3DS RDIMM support is planned for 1Q/2018.
UDIMMs are not supported.
Mixing RDIMMs and LRDIMMs is not supported.
Mixing 3DS RDIMMs with either RDIMMs or LRDIMMs is not supported.
Mixing x4 and x8 DIMMs is supported.
For best performance, populate memory DIMMs in quantities of 6 or 12 per processor, so that all
memory channels are used.
The following memory protection technologies are supported:
ECC
SDDC (for x4-based memory DIMMs; look for "x4" in the DIMM description)
ADDDC (for x4-based memory DIMMs)
Memory channel mirroring
Memory rank sparing
If memory channel mirroring is used, then DIMMs must be installed in pairs (minimum of one pair per
processor), and both DIMMs in a pair must be identical in type and size. 50% of the installed capacity is
available to the operating system.
If memory rank sparing is used, then a minimum of one quad-rank DIMM or two single-rank or dual-rank
DIMMs must be installed per populated channel (the DIMMs do not need to be identical). In rank sparing
mode, one rank of a DIMM in each populated channel is reserved as spare memory. The largest rank in
the channel will be automatically selected as the spare rank. The amount of memory available to the
operating system depends on the number, capacity and rank counts of the DIMMs installed.
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