IBM 88554RU Installation Guide - Page 31
PCI-X board assembly, PCI-X subsystem
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1.4.3 PCI-X board assembly Strictly speaking the PCI-X board assembly does not truly exist in the same way that the processor board and memory board assemblies do. The term is used here to loosely describe the PCI-X board and I/O subsystem that together comprise the other components of the machine. The two PCI-X bridges in the XA-64 chipset provide support for 33, 66, 100, and 133 MHz devices using 4 PCI-X buses (labelled A-D in Figure 1-4 on page 8). The PCI-X bridges also have two 1 GBps bi-directional Remote Expansion I/O (RXE) ports for connectivity to the RXE-100 Expansion Enclosure. The RXE-100 provides up to an additional 12 PCI-X slots and can be connected by a single cable to port A or to both ports A and B to provide redundancy. The rear panel of the x455, which indicates the location of the RXE Expansion Ports, is shown in Figure 1-2 on page 5. PCI-X subsystem There are six available PCI-X slots in four buses. These are shown in Figure 1-9. PCI-X slot 4 PCI-X slot 3 (100 MHz) (100 MHz) PCI-X slot 5 (133 MHz) Back of server PCI-X slot 2 (66 MHz) PCI-X slot 6 (133 MHz) PCI-X slot 1 (66 MHz) Bus: D C B A Figure 1-9 PCI-X slot information Only 3.3V cards are supported, but all slots will accept the following: 32-bit or 64-bit cards 33MHz, 66MHz, 100MHz or 133MHz cards Chapter 1. Technical description 17