Memory Options - IBM x3850 X6 Planning And Implementation Manual

3.8.1 Memory options

In this section, we describe available memory options, memory characteristics, and speeds
depending on the selected memory mode.
Table 3-5 lists the memory options that are available for x3850 X6 and x3950 X6 servers:
Table 3-5 Memory options
Part Feature Description
number code
RDIMMs
00D5024 A3QE 4GB (1x4GB, 1Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
00D5036 A3QH 8GB (1x8GB, 1Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
46W0672 A3QM 16GB (1x16GB, 2Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
LRDIMMs
46W0676 A3SR 32GB (1x32GB, 4Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP LRDIMM
46W0741 A451 64GB (1x64GB, 8Rx4, 1.35V) PC3-10600
DDR3 1333MHz LP LRDIMM
Table 3-6 shows the characteristics of the supported DIMMs and the memory speeds. The
cells highlighted in grey indicate that the X6 servers support higher memory frequencies or
larger memory capacity, or both, than the Intel processor specification defines.
Memory speed: In Performance mode, memory channels operate independently, and the
SMI2 link operates at twice the DDR3 speed. In RAS mode, two channels operate
synchronously, and the SMI2 link operates at the DDR3 speed.
Table 3-6 Maximum memory speeds
DIMM
specification
Ranks Single-rank DIMM
Rated speed
Rated voltage
Operating voltage 1.35 V
Max. DIMM 8 GB
capacity
Max. memory 0.75 TB /
a
capacity 1.5 TB
Maximum operating speed - Performance mode (2:1 mode - SMI2 link operates at twice the DDR3 speed shown)
1 DIMM / channel 1333 MHz
70
IBM System x3850 X6 and x3950 X6 Planning and Implementation Guide
RDIMM
Dual-rank DIMM
1600 MHz 1600 MHz
1.35 V
1.5 V 1.35 V
8 GB 16 GB
0.75 TB / 1.5 TB /
1.5 TB 3 TB
1333 MHz 1333 MHz
Maximum
supported
(x3850 X6 / x3950 X6)
96 / 192 (24 per CPU)
96 / 192 (24 per CPU)
96 / 192 (24 per CPU)
96 / 192 (24 per CPU)
96 / 192 (24 per CPU)
Quad-rank LR-DIMM
1600 MHz
1.35 V 1.35 V
1.5 V 1.35 V
16 GB 32 GB
1.5 TB / 3 TB /
3 TB 6 TB
1333 MHz 1333 MHz
Standard
models
where used
-
A4x, B1x, B3x,
BAx, C1x, C4x,
CAx, CCx
H1x, HAx
-
-
LR-DIMM
8-rank LR-DIMM
1333 MHz
1.35 V
1.5 V 1.35 V
32 GB 64 GB
3 TB / 6 TB /
6 TB 12 TB
1333 MHz 1333 MHz 1333 MHz
1.5 V
64 GB
6 TB /
12 TB