194 IBM eX5 Implementation Guide
5.10 Memory
The HX5 2-socket has eight DIMM sockets per processor (a total of 16 DIMM sockets),
supporting up to 128 GB of memory when using 8 GB DIMMs. With the addition of the MAX5
memory expansion blade, a single HX5 blade has access to a total of 40 DIMM sockets
supporting up to 320 GB of RAM when using 8 GB DIMMs.
The HX5 and MAX5 use registered Double Data Rate 3 (DDR3), very low profile (VLP)
DIMMs and provide reliability, availability, and serviceability (RAS) and advanced Chipkill
memory protection. For more information about Chipkill memory protection, see “Chipkill” on
page 29. For information about RAS, see 2.3.6, “Reliability, availability, and serviceability
(RAS) features” on page 28.
This section has the following topics:
5.10.1, “Memory options” on page 194
5.10.2, “DIMM population order” on page 196
5.10.3, “Memory balance” on page 199
5.10.4, “Memory mirroring” on page 200
5.10.5, “Memory sparing” on page 202
To see a full list of the supported memory features, such as Hemisphere Mode, Chipkill,
nonuniform memory access (NUMA), and memory mirroring, and an explanation of each
memory feature, see 2.3, “Memory” on page 22.
5.10.1 Memory options
Table 5-13 lists the memory options for the HX5 and MAX5. They are the same options for
both products
with the exception of the 2 GB DIMM option.
Table 5-13 Memory options HX5 and MAX5
Tip: Memory must be installed in pairs of two identical DIMMs, or in quads if memory
mirroring is enabled. The options in Table 5-13, however, are for single DIMMs.
Part
number
FC Capacity Support
in MAX5
Description Rank Speed
a
a. Although the speed of the supported memory DIMMs is as high as 1333 MHz, the actual memory bus speed is a
function of the processor and the memory buffers used in the HX5 server. In the HX5, memory speed is up to
978 MHz and in the MAX5, memory speed is up to 1066 MHz. See Table 5-12 on page 192 for specifics.
44T1486 1916 1x 2 GB No 2GB PC3-10600 CL9 ECC VLP (2Rx8, 1.5V, 1Gb) Dual 1333 MHz
44T1596 1908 1x 4 GB
Yes 4GB PC3-10600 CL9 ECC VLP (2Rx8, 1.5V, 2Gb) Dual 1333 MHz
46C7499 1917 1x 8 GB
Yes 8GB PC3-8500 CL7 ECC VLP (4Rx8, 1.5V, 2Gb) Quad 1066 MHz
49Y1554 A13Q 1x 8 GB
Ye s
b
b. This DIMM supports redundant bit steering (RBS) when used in the MAX5, as described in “Redundant bit steering”
on page 29.
8GB PC3-10600 CL9 ECC (1x8GB, 2Rx4, 1.5V 2Gb) Dual 1333 MHz
Two GB DIMM option: The 2 GB DIMM option that is listed in Table 5-13 is not supported
in the MAX5, because the MAX5 does not support mixing DIMMs with various DRAM
technologies, such as 1 Gb versus 2 Gb.
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