Specifications

54 IBM Power 770 and 780 Technical Overview and Introduction
Figure 2-13 shows the physical memory DIMM topology for the Power 780 with four
single-chip-modules (SCMs).
Figure 2-13 Physical memory DIMM topology for the Power 780 with four SCMs
For the POWER 780 with the four SCMs, there are 16 buffered DIMM slots available:
򐂰 DIMM slots J1A to J4A are connected to the memory controller on POWER7 processor 0.
򐂰 DIMM slots J5A to J8A are connected to the memory controller on POWER7 processor 1.
򐂰 DIMM slots J1B to J4B are connected to the memory controller on POWER7 processor 2.
򐂰 DIMM slots J5B to J8B are connected to the memory controller on POWER7 processor 3.
The memory plugging rules are as follows:
򐂰 Plug sequence will always allow for memory mirroring (for example, no Feature Code
needs to be specified for memory mirroring). The green cells in the following tables
indicate the AMM (Active Memory Mirroring) base configuration.
򐂰 DIMMs must be installed 4x DIMMs at a time, referred to as a DIMM-quad and identified in
Table 2-7 on page 55 and Table 2-8 on page 55 by colors.
򐂰 DIMM-quads must be homogeneous. (Only DIMMs of the same capacity are allowed on
the same Quad.)
򐂰 A DIMM-quad is the minimum installable unit for subsequent upgrades.
򐂰 Although each drawer can have different capacity memory DIMMs, for maximum memory
performance, the total memory capacity on each memory controller should be equivalent.
򐂰 The DIMM-quad placement rules for a single enclosure are as follows (see Figure 2-12 on
page 53 for the physical memory topology):
– Quad 1: J1A, J2A, J5A, J6A (mandatory minimum for each enclosure)
B
B
B
B
Regulator #5
DDR3 DIMM #5
DDR3 DIMM #6
DDR3 DIMM #7
DDR3 DIMM #8
DDR3 DIMM #1
DDR3 DIMM #2
DDR3 DIMM #3
DDR3 DIMM #4
DDR3 DIMM #13
DDR3 DIMM #14
DDR3 DIMM #15
DDR3 DIMM #16
DDR3 DIMM #9
DDR3 DIMM #10
DDR3 DIMM #11
DDR3 DIMM #12
Regulator #6
Regulator #7
TPMD Slot
I/O Connectors
P3-C1
P3-C2
P3-C3
P3-C4
P3-C6
P3-C7
P3-C8
P3-C9
P3-C10
P3-C11
P3-C12
P3-C13
P3-C17
P3-C18
P3-C19
P3-C20
J1A
J2A
J3A
J4A
J5A
J6A
J7A
J8A
J1B
J2B
J3B
J4B
J5B
J6B
J7B
J8B
Quad #1
Quad #1
Quad #2
Quad #2
Quad #1
Quad #1
Quad #2
Quad #2
Quad #3
Quad #3
Quad #4
Quad #4
Quad #3
Quad #3
Quad #4
Quad #4
P7
SCM
P7
SCM
Regulator #1
Regulator #4
B
B
MC0
MC0
Regulator #3
Regulator #2
P7
SCM
B
MC0
P7
SCM
B
MC0