IBM System x3850 X6 15
Memory options
IBM DDR3 memory is compatibility tested and tuned for optimal IBM System x® performance and
throughput. IBM memory specifications are integrated into the light path diagnostics for immediate system
performance feedback and optimum system uptime. From a service and support standpoint, IBM memory
automatically assumes the IBM system warranty, and IBM provides service and support worldwide.
The x3850 X6 supports DDR3 memory operating at speeds up to 1600 MHz. The x3850 X6 supports up to
96 DIMMs when all processors are installed, 24 DIMMs per processor. Each processor has four memory
channels that are implemented using Scalable Memory Interface generation 2 (SMI2) chips, and the
server implements three DIMMs per channel. The processor and the corresponding memory DIMM slots
are on the Compute Book.
The following table lists the memory options that are available for x3850 X6.
Table 4. Memory options
Part number Feature code Description Maximum
supported
x3850 X6
Models
where used
RDIMMs
00D5024 A3QE 4GB (1x4GB, 1Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
96 (24 per CPU) -
00D5036 A3QH 8GB (1x8GB, 1Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
96 (24 per CPU) A4x, B1x, B3x,
C1x, C4x,
46W0672 A3QM 16GB (1x16GB, 2Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
96 (24 per CPU) A7x, A8x, A9x
LRDIMMs
46W0676 A3SR 32GB (1x32GB, 4Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP LRDIMM
96 (24 per CPU) -
46W0741 A451 64GB (1x64GB, 8Rx4, 1.35V) PC3-10600
DDR3 1333MHz LP LRDIMM
96 (24 per CPU) -
The following rules apply when selecting the memory configuration:
The server supports RDIMMs and LRDIMMs.
Mixing different types of memory (RDIMMs and LRDIMMs) is not supported.
The maximum number of ranks per one DDR3 channel is six with RDIMMs or 24 with LRDIMMs.
In RAS (lockstep) mode, DIMMs must be installed in a pair.
The maximum quantity of DIMMs that can be installed in the server depends on the number of
processors, DIMM type, rank, and operating voltage, as shown in the "Maximum qty supported" row in
the following table.
All DIMMs in the server operate at the same speed, which is determined as the lowest value of one of
the following options:
Memory speed that is supported by the specific processor.
o
Lowest of maximum operating speeds for selected memory configuration that depends on rated
o
speed, operating voltage, and quantity of DIMMs per channel, as shown under "Maximum
operating speed" section in the following table.
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