Memory Features - IBM Power 750 Technical Overview And Introduction

1.5.6 Memory features

In POWER7+ systems, DDR3 memory is used throughout. There are four capacity memory
features, each has two DIMMs: 8 GB, 16 GB, 32 GB, or 64 GB. The Power 760 supports all
four memory features. The Power 750 does not support the 64 GB feature.
The POWER7+ DDR3 memory has been redesigned to provide greater bandwidth and
capacity. The 16, 32 and 64 GB DIMMs use 4 GB DRAMs. This enables operating at a higher
data rate for large memory configurations. All memory cards have eight memory DIMM slots
running at speeds of 1066 MHz and must be populated with POWER7+ DDR3 Memory
DIMMs. Each DCM supports two memory riser cards.
The DIMMs are plugged into memory riser cards (FC EM01) located on the processor and
memory backplane (FC EPT1). Each riser card has eight DIMM slots.
Figure 1-4 outlines the general connectivity of a POWER7+ DCM and DDR3 memory DIMMs.
The figure shows the eight memory channels (four per DCM).
DCM
Figure 1-4 Outline of POWER7+ processor connectivity to DDR3 DIMMs in Power 750 and Power 760
16
IBM Power 750 and 760 Technical Overview and Introduction
MC0
Channel B
POWER 7+
Chip 0
MC0
Channel A
MC1
Channel D
POWER 7+
Chip 1
MC1
Channel C
DDR3 RDIMM Slot 7
DDR3 RDIMM Slot 8
BC-B
DDR3 RDIMM Slot 1
DDR3 RDIMM Slot 2
Memory Riser Card #2
DDR3 RDIMM Slot 5
DDR3 RDIMM Slot 6
BC-A
DDR3 RDIMM Slot 3
DDR3 RDIMM Slot 4
DDR3 RDIMM Slot 7
DDR3 RDIMM Slot 8
BC-B
DDR3 RDIMM Slot 1
DDR3 RDIMM Slot 2
Memory Riser Card #1
DDR3 RDIMM Slot 5
DDR3 RDIMM Slot 6
BC-A
DDR3 RDIMM Slot 3
DDR3 RDIMM Slot 4
MC: Memory Controller
BC: Memory Buffer