Chapter 2. Architecture and technical overview
29
Figure 2-6 shows the logical design of the Power E850C server with four processor modules
installed.
Figure 2-6 Logical diagram for a Power E850C server with four processor modules installed
2.3 The IBM POWER8 processor
The POWER8 processor is manufactured by using the IBM 22 nm Silicon-On-Insulator (SOI)
technology. Each chip is 649 mm
2
and contains 4.2 billion transistors. The chip contains
12 cores, two memory controllers, and an interconnection system that connects all
components within the chip. On some systems, only 6, 8, 10, or 12 cores per processor might
be available to the server. Each core has 512 KB of L2 cache, and all cores share 96 MB of
L3 embedded dynamic random access memory (eDRAM). The interconnect also extends
through module and board technology to other POWER8 processors in addition to DDR3
memory and various I/O devices.
POWER8 systems use memory buffer chips to interface between the POWER8 processor
and DDR3 or DDR4 memory. Each buffer chip also includes an L4 cache to reduce the
latency of local memory accesses.
For an in-depth discussion on the POWER8 processor, see the
IBM Power System E850
Technical Overview and Introduction, REDP-5222 at:
http://www.redbooks.ibm.com/abstracts/redp5222.html
USB 3.0 (2 x Front, 2 x Rear )
PEX
PCIe Gen3 x16 FHHL slot C8
CDIMMs
CDIMMs
CDIMMs
PCIe Gen3 x16 FHHL slot C3
PCIe Gen3 x16 FHHL slot C2
PCIe Gen3 x8 FHHL slot C11
PCIe Gen3 x16 FHHL slot C9
PCIe Gen3 x8 FHHL slot C7
PCIe Gen3 x8 FHHL slot C6
CDIMMs
IO Planar
CPU Planar
PCIe Gen3 x16 FHHL slot C1
PCIe Gen3 x16 FHHL slot C10
PCIe Gen3 x16 FHHL slot C12
PCIe Gen3 x16 FHHL slot C4
SAS Cntrl
RAID #1
SAS Cntrl
RAID #2
RAID Backplane
Service Processor card
2 x 1GE, 1 x Serial
2 x USB 2.0
Op-panel
Storage
BackPlane
8 SFF
4 1.8” SSD
DVD
48 PCIe G3 lanes
Processor Module 2
Chip-0
Chip-1
48 PCIe G3 lanes
Processor Module 3
Chip-0
Chip-1
48 PCIe G3 lanes
Processor Module 1
Chip-0
Chip-1
48 PCIe G3 lanes
Processor Module 0
Chip-0
Chip-1
Max 19.2 GBps
Max
24 GBps
PCIe
x8
PCIe
x8
PCIe
x8
PCIe
x16
PCIe
x16
PCIe
x16
PCIe
x16
PCIe
x16
PCIe
x16
PCIe
x16
PCIe
x8
PCIe
x16
Max
24 GBps
Max
24 GBps
Max
24 GBps
Summary of Contents for E850C
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