PA-RISC Processors

PA-8900 processor

Overview

The PA-8900 is a slightly tweaked PA-8800 PA-RISC processor with a doubled L2 cache and higher clock speed, released by HP in 2005 only one year after the PA-8800 as the last PA-RISC processor in its lineup. After HP dropped its line of Itanium workstations the PA-8900-powered C8000 were one of the last HP-UX workstations.

Information on the PA-8900 is limited, as was apparent distribution in the market.

Details

PA-RISC version 2.0, 64-bit architecture, multi-processor capable, 4-way superscalar
Two cores and ten functional units per core: 2 integer ALUs, 2 shift/merge units, 2 complete load/store pipelines, 2 Floating Point multiply/accumulate units, 2 Floating Point divide/square root units
IRB: 56-entry instruction queue/reorder buffer
TLB: 240-entry fully-associative dual-ported per core
BTAC: 32-entry Branch Target Address Cache; BHT: 2048-entry Branch History Table per core
Cache L1 0.75 MB I and 0.75 MB D per core on-chip, 4-way set associative
Cache L2 64 MB off-chip
Cache L2 is shared between the cores, L2 controller is on-chip
Memory: up to 16 TB memory supported with 44-bit physical addresses
Memory and I/O controllers are external
Bi-endian support
MAX-2 multimedia extensions subword arithmetic for multimedia applications
Itanium 2 processor bus, 200 MHz clock, 128-bit, 6.4 GB/s bandwidth
Up to 1.1 GHz clock speed with 1.5 V core voltage
23.6×15.5 mm² die, 317,000,000 FETs, 0.13µ, 8-layer Silicon-on-Insulator CMOS

Used in

HP 9000 rp3410, rp3440 servers
HP 9000 rp4410, rp4440 servers
HP 9000 rp7440, rp8440 servers
HP C8000 workstations
HP 9000 L1500-9X (rp5430), L2000-9X (rp5450) servers
HP 9000 N4000-9X (rp7405, rp7410) servers
HP 900 Superdome mainframes

References

Overview of the HP 9000 rp3410-2, rp3440-4, rp4410-4, and rp4440-8 Servers (PDF, 700 KB): Hewlett-Packard (2005).

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