Chapter 2. Architecture and technical overview 63
Table 2-10 External GX++ I/O bandwidth
2.6 Internal I/O subsystem
The internal I/O subsystem resides on the I/O planar, which supports six PCIe slots. All PCIe
slots are hot-pluggable and enabled with Enhanced Error Handling (EEH). In the unlikely
event of a problem, EEH-enabled adapters respond to a special data packet that is generated
from the affected PCIe slot hardware by calling system firmware, which examines the affected
bus, allows the device driver to reset it, and continues without a system reboot. For more
information about RAS on the I/O buses, see Chapter 4, “Continuous availability and
manageability” on page 149.
The I/O backplane contains two I/O controllers for enhanced I/O redundancy and flexibility.
PCIe slots 1 - 4 are connected to I/O controller A. The I/O controller B connects to PCIe slots
5 - 6, the multifunction card, and to the DVD-RAM drive.
Table 2-11 lists the slot configuration of the Power 750 and Power 760.
Table 2-11 Slot configuration of the Power 750 and Power 760
Processor card Slot description Frequency GX++ Bandwidth
(maximum theoretical)
Power 760
3.416 GHz
3.136 GHz
Power 750
4.060 GHz
3.500 GHz
CPU Socket 1(DCM1)
GX bus 1
2.5 GHz 20 GBps
CPU Socket 1(DCM1)
GX bus 0
2.5 GHz 20 GBps
Total (External I/O) 40 GBps
Bandwidth: Technically, all the other interfaces, such as daughter card, asynchronous
port, DVD, USB, and the PCI Express slots are connected to two other internal GX++ ports
through two P7IOC chipsets. So, theoretically, if all the ports, devices, and PCIe slots are
considered, the total I/O bandwidth for a system is 80 GBps.
Slot
number
Description Location
code
PCI host bridge
(PHB)
Maximum card
size
Slot 1 PCIe Gen2 x8 P2-C1 P7IOC A PCIe PHB5 Full length
Slot 2 PCIe Gen2 x8 P2-C2 P7IOC A PCIe PHB4 Full length
Slot 3 PCIe Gen2 x8 P2-C3 P7IOC A PCIe PHB3 Full length
Slot 4 PCIe Gen2 x8 P2-C4 P7IOC A PCIe PHB2 Full length
Slot 5 PCIe Gen2 x8 P2-C5 P7IOC B PCIe PHB5 Full length
Slot 6 PCIe Gen2 x8 P2-C6 P7IOC B PCIe PHB4 Full length
Slot 7 GX++ P1-C2 - -
Slot 8 GX++ P1-C3 - -
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