78 IBM eX5 Implementation Guide
DIMMs for the x3850 X5
Table 3-11 shows the available DIMMs that are supported in the x3850 X5 server. The table
also indicates the DIMM options that are also supported in the MAX5. When used in the
MAX5, the DIMMs have separate feature codes, which are shown as -
fc.
Table 3-11 x3850 X5 supported DIMMs
As with Intel Xeon 5500 processor (Nehalem-EP), the speed at which the memory that is
connected to the Xeon 7500 and 6500 processors (Nehalem-EX) runs depends on the
capabilities of the specific processor. With Nehalem-EX, the scalable memory interconnect
(SMI) link runs from the memory controller that is integrated in the processor to the memory
buffers on the memory cards.
The SMI link speed is derived from the processor QPI link speed:
6.4 GT/s QPI link speed capable of running memory speeds up to 1066 MHz
5.86 GT/s QPI link speed capable of running memory speeds up to 978 MHz
4.8 GT/s QPI link speed capable of running memory speeds up to 800 MHz
To see more information about how memory speed is calculated with QPI, see 2.3.1,
“Memory speed” on page 22.
Part
number
x3850 X5
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 1712 2 GB (1x 2GB) 1Rx8, 2 Gb PC3-10600R DDR3-1333 Yes (fc 2429) 1333 MHz
b
b. Although 1333 MHz memory DIMMs are supported in the x3850 X5, the memory DIMMs run at a maximum speed of
1066 MHz.
Single x8
44T1599 1713 4 GB (1x 4GB), 2Rx8, 2 Gb PC3-10600R DDR3-1333
Yes (fc 2431) 1333 MHz Dual x8
46C7448 1701 4 GB (1x 4GB), 4Rx8, 1 Gb PC3-8500 DDR3-1066 No 1066 MHz Quad x8
46C7482 1706 8 GB (1x 8GB), 4Rx8, 2 Gb PC3-8500 DDR3-1066 Yes (fc 2432) 1066 MHz Quad x8
46C7483 1707 16 GB (1x 16GB), 4Rx4, 2 Gb PC3-8500 DDR3-1066
Ye s
c
(fc 2433)
c. The 16 GB memory option is supported in the MAX5 only when it is the only type of memory that is used in the MAX5.
No other memory options can be used 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.
1066 MHz Quad x4
Guidelines:
Memory options must be installed in matched pairs. Single options cannot be installed,
so the options that are shown in Table 3-11 need to be ordered in quantities of two.
You can achieve additional performance by enabling Hemisphere Mode, which is
described in “Hemisphere Mode” on page 26. This mode requires that the memory
options are installed in matched quads.
The maximum memory speed that is supported by Xeon 7500 and 6500 (Nehalem-EX)
processors is 1066 MHz (1,333 MHz speed is not supported). Although the 1333 MHz
DIMMs are still supported in the x3850 X5, they can operate at a speed of at most
1066 MHz.
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