Chapter 4. IBM System x3690 X5 137
MAX5 memory options
Table 4-10 shows the available memory options that are supported in the MAX5 memory
expansion unit. These options are a subset of the options that are supported in the x3690 X5
because the MAX5 requires that all DIMMs use identical DRAM technology, which is either
2 Gbit x8 or 2 Gbit x4 (but not both at the same time).
Table 4-10 DIMMs supported in the MAX5
MAX5 memory population order
The memory installed in the MAX5 operates at the same speed as the memory that is
installed in the x3690 X5 server. As explained in 2.3.1, “Memory speed” on page 22, the
memory speed is derived from the QPI link speed of the installed processors, which in turn
dictates the maximum SMI link speed, which in turn dictates the memory speed.
4.7, “Processor options” on page 130, summarizes the memory speeds for all of the models
of Intel Xeon 7500 series CPUs.
Memory options: The memory options listed here are also supported in the x3690 X5 (but
under separate feature codes for CTO clients). Table 4-7 on page 133 lists additional
memory options, which are also supported in the x3690 X5 server but not in the MAX5.
Part
number
MAX5
feature
code
Memory Supported
in MAX5
Memory
speed
a
a. Memory speed is also controlled by the memory bus speed, as specified by the processor model selected. The
actual memory bus speed is the lower of both the processor memory bus speed and the DIMM memory bus speed.
Ranks
44T1592 2429 2 GB (1x 2GB) 1Rx8, 2Gbit PC3-10600R DDR3-1333
Yes 1333 MHz
b
b. Although 1333 MHz memory DIMMs are supported in the x3690 X5, the memory DIMMs run at a maximum speed
of 1066 MHz.
Single x8
44T1599 2431 4 GB (1x 4GB), 2Rx8, 2Gbit PC3-10600R DDR3-1333
Yes 1333 MHz Dual x8
46C7482 2432 8 GB (1x 8GB), 4Rx8, 2Gbit PC3-8500 DDR3-1066
Yes 1066 MHz Quad x8
46C7483 2433 16 GB (1x 16GB), 4Rx4, 2Gbit PC3-8500 DDR3-1066
Ye s
c
d
c. The 16 GB memory option is only supported in the MAX5 when it is the only type of memory used in the MAX5. No
other memory options can be used in the MAX5 if this option is installed in the MAX5.
d. This DIMM supports redundant bit steering (RBS), as described in “Redundant bit steering” on page 29.
1066 MHz Quad x4
Use of the 16 GB memory option: The 16 GB memory option, part number 46C7483, is
supported in the MAX5 only when it is the only type of memory used in the MAX5. No other
memory options can be used in the MAX5 if this option is installed in the MAX5.
Redundant bit steering: Redundant bit steering (RBS) is not supported on the x3690 X5
itself, because the integrated memory controller of the Intel Xeon 7500 processor does not
support the feature. See “Redundant bit steering” on page 29 for details.
The MAX5 memory expansion unit supports RBS, but only with x4 memory and not x8
memory. As shown in Table 4-10, the 16 GB DIMM, part number 46C7483, uses x4 DRAM
technology. RBS is automatically enabled in the MAX5 memory port, if all DIMMs that are
installed to that memory port are x4 DIMMs.
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