Specifications

Chapter 2. Architecture and technical overview 53
All the memory DIMMs for the Power 770 and Power 780 are Capacity Upgrade on Demand
capable and must have a minimum of 50% of its physical capacity activated. For example, the
minimum installed memory for both servers is 64 GB RAM, whereas they can have a
minimum of 32 GB RAM active.
Figure 2-12 shows the physical memory DIMM topology for the Power 770 and Power 780
with two single-chip-modules (SCMs).
Figure 2-12 Physical memory DIMM topology for the Power 770 and Power 780 with two SCMs
For the POWER 770 and POWER 780 server models with two SCMs, there are 16 buffered
DIMM slots:
򐂰
DIMM slots J1A to J8A are connected to the memory controllers on POWER7 processor 0.
򐂰 DIMM slots J1B to J8B are connected to the memory controllers on POWER7 processor 1.
These DIMMs slots are divided into four Quads, each Quad having four DIMMs.
Note: DDR2 memory (used in POWER6 processor-based systems) is not supported in
POWER7 processor-based systems.
P7
SCM
A
B
A
B
P7
SCM
Regulator #1
Regulator #4
A
B
A
B
Regulator #5
DDR3 DIMM #5
DDR3 DIMM #6
DDR3 DIMM #7
DDR3 DIMM #8
MC0
MC1
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
MC0
MC1
Regulator #6
Regulator #7
TPMD Slot
Regulator #3
Regulator #2
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