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Chapter 2. Architecture and technical overview 31
Figure 2-7 Memory placement for the p5-520 and p5-520Q servers
2.3.1 Memory placement rules
Table 2-2 lists the memory features that are available at the time of writing for the p5-520 and
p5-520Q servers.
Table 2-2 Available memory features
Memory can be pluggable in pairs or quads, as required by the total memory requirement.
Memory feature numbers might be mixed within a system. The DIMMs slots are accessed by
first removing the PCI riser book.
When additional memory is added to a system using FC 1930, an additional feature, FC
1930, must be added to the original pair to make a quad, allowing one additional quad to be
added to the system. Memory is installed in the first quad in the following order: J2A, J0A,
J2C, and J0C; and for the second quad, in the order J2B, J0B, J2D, and J0D. Memory must
be balanced across the DIMM quad slots. The Service Information label, located on the top
cover of the system, provides memory DIMMs slot location information.
SMI-II
SMI-II
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
2x8 B
@528 MHz
J2A
J2B
J2C
J2D
J0D
J0C
J0B
J0A
First quad Second quad
SMI-II
SMI-II
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
2x8 B
@528 MHz
J2A
J2B
J2C
J2D
J0D
J0C
J0B
J0A
First quad Second quad
POWER5+
DCM (Dual-Core Module)
or
QCM (Quad-Core Module)
SMI-II SMI-II
1056 MHz
2x8 B for read
2x8 B for write
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
2x8 B
@528 MHz
POWER5+
DCM (Dual-Core Module)
or
QCM (Quad-Core Module)
SMI-II SMI-II
1056 MHz
2x8 B for read
2x8 B for write
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
DIMM CX JXX “Ax”
2x8 B
@528 MHz
Feature code Description
1930 1 GB (2 x 512 MB) DIMMs, 276-pin DDR2, 533 MHz SDRAM
1931 2 GB (2 x 1 GB) DIMMs, 276-pin DDR2, 533 MHz SDRAM
1932 4 GB (2 x 2 GB) DIMMs, 276-pin DDR2, 533 MHz SDRAM
1934 8 GB (2 x 4 GB) DIMMs, 276-pin DDR2, 533 MHz SDRAM