I/O Subsystem; Power4 And Power5 Memory Structure Comparison - IBM p5 590 System Handbook

Figure 1-4 POWER4 and POWER5 memory structure comparison
There are two types of memory technologies offered, namely DDR1 and DDR2.
Equipped with 8 GB of memory in its minimum configuration, the p5-590 can be
scaled to 1 TB using DDR1 266 MHz memory. From 8 GB to 128 GB of DDR2
533 MHz memory, useful for high-performance applications, is available. The
p5-595 can be scaled from 8 GB to 2 TB of DDR1 266 MHz memory; From 8 GB
to 256 GB of DDR2 533 MHz memory.
Additional information about memory can be found in 2.3, "Memory subsystem"
on page 26 and 5.2.4, "Memory configuration rules" on page 123.

1.3.3 I/O subsystem

Using the RIO-2 ports in the processor books, up to twelve I/O drawers can be
attached to a p5-595 and up to eight I/O drawers to the p5-590, providing up to
9.3 TB and 14 TB of 15 K rpm disk storage, respectively. Each 4U (4 EIA unit)
drawer provides 20 hot-plug, blind-swap PCI-X I/O adapter slots, 16 or 8
front-accessible, hot-swappable disk drive bays and four or two integrated Ultra3
SCSI controllers. I/O drawers can be installed in the primary 24-inch frame or in
an optional expansion frame. Attachment to a wide range of IBM TotalStorage®
storage system offerings – including disk storage subsystems, storage area
network (SAN) components, tape libraries, and external media drives – is also
supported.
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Chapter 1. System overview