Memory Dimm Options; X3690 X5 Memory Population Order - IBM System x3850 X5 Implementation Manual

The memory uses DDR3 technology and operates at memory speeds of 800, 978, and
1066 MHz. The memory speed is dictated by the memory speed of the processor (see
Table 4-5 on page 130). For more information about how this is calculated, see 2.3.1,
"Memory speed" on page 22.

4.8.1 Memory DIMM options

Table 4-7 shows the available memory options that are supported in the x3690 X5 server.
Table 4-7 x3690 X5/MAX5 Supported DIMMs
Part x3690 X5 Memory
number feature
code
44T1592 1712 2 GB (1x 2GB) 1Rx8, 2Gbit PC3-10600R DDR3-1333
44T1599 1713 4 GB (1x 4GB), 2Rx8, 2Gbit PC3-10600R DDR3-1333
46C7448 1701 4 GB (1x 4GB), 4Rx8, 1Gbit PC3-8500 DDR3-1066
46C7482 1706 8 GB (1x 8GB), 4Rx8, 2Gbit PC3-8500 DDR3-1066
46C7483 1707 16 GB (1x 16GB), 4Rx4, 2Gbit PC3-8500 DDR3-1066
a. Memory speed is also controlled by the memory bus speed, as specified by the selected processor model. The actual
memory bus speed is the lower of both the processor memory bus speed and the DIMM memory bus speed.
b. Although 1333 MHz memory DIMMs are supported in the x3690 X5, the memory DIMMs run at a maximum speed of
1066 MHz.
c. The 16 GB memory option is only supported in the MAX5 when it is the only type of memory used in the MAX5. You
cannot use any other memory options in the MAX5 if this option is installed in the MAX5. This DIMM also supports
redundant bit steering (RBS) when used in the MAX5, as described in "Redundant bit steering" on page 29.
Details:
Only certain memory options supported in the x3690 X5 are also supported in the
MAX5, as indicated in Table 4-7. When ordering DIMMs for the MAX5 with feature
codes (configure-to-order (CTO) clients only), use the special MAX5 feature codes 24xx
as listed. See "MAX5 memory options" on page 137 for more information.
Memory options must be installed in matched pairs. Single options cannot be installed;
therefore, the options listed must be ordered in a quantity of two.
The maximum memory speed that is supported by Xeon 7500 and 6500 (Nehalem-EX)
processors is 1066 MHz. DIMMs will not run at 1333 MHz.
Mixing DIMMs is supported by all DIMMs, except 16 GB DIMMs, and operates at the
speed of the slowest installed DIMM. We do not recommend mixing DIMMs for
performance reasons.

4.8.2 x3690 X5 memory population order

Memory DIMM installation is key to maximizing system performance. In this section, we
specify how to install DIMMs.
Figure 4-14 on page 134 shows the slot numbering for DIMM installation.
Supported Memory
in MAX5 speed
Yes (fc 2429) 1333 MHz
Yes (fc 2431) 1333 MHz
No 1066 MHz
Yes (fc 2432) 1066 MHz
c
Yes (fc 2433) 1066 MHz
Chapter 4. IBM System x3690 X5
Ranks
a
b
Single x8
Dual x8
Quad x8
Quad x8
Quad x4
133