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IBM System x3950 X6 12

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 x3950 X6 supports DDR3 memory operating at speeds up to 1600 MHz. The server supports up to

192 DIMMs when all eight 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 x3950 X6.

Table 4. Memory options

Part

number

Feature

code

Description Maximum

supported

x3950 X6

Standard

models

where used

RDIMMs

00D5024 A3QE 4GB (1x4GB, 1Rx4, 1.35V) PC3L-12800 CL11 ECC

DDR3 1600MHz LP RDIMM

192 (24 per

CPU)

00D5036 A3QH 8GB (1x8GB, 1Rx4, 1.35V) PC3L-12800 CL11 ECC

DDR3 1600MHz LP RDIMM

192 (24 per

CPU)

BAx, CAx, CCx

46W0672 A3QM 16GB (1x16GB, 2Rx4, 1.35V) PC3L-12800 CL11

ECC DDR3 1600MHz LP RDIMM

192 (24 per

CPU)

LRDIMMs

46W0676 A3SR 32GB (1x32GB, 4Rx4, 1.35V) PC3L-12800 CL11

ECC DDR3 1600MHz LP LRDIMM

192 (24 per

CPU)

46W0741 A451 64GB (1x64GB, 8Rx4, 1.35V) PC3-10600 DDR3

1333MHz LP LRDIMM

192 (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 "Max. 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.

Lowest of maximum operating speeds for selected memory configuration that depends on rated

speed, operating voltage, and quantity of DIMMs per channel, as shown under "Maximum

operating speed" section in the following table.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 47 48

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