PA-RISC information - since 1999

PA-RISC Processors

PA-8700 (PCX-W2) processor


The PA-8700 processor is an 64-bit HP PA-RISC processor from HP, released in 2001 building on an enhanced PA-8500 core with several modifications. As with other PA-8x00 processors, the logic core is close to the original PA-8000 from 1997. The PA-8700 used significant larger on-chip L1 caches and TLB while switching to a new manufacturing process at IBM helped increase the clock speed to 750-875 MHz.

At its time of the early 2000s, the PA-8700 was one of the largest commercial processors shipping and one of the first manufactured in Silicon on Insulator (SoI). The PA-8700 is superscalar (4-way) and multi-processor (SMP) capable.

HP PA-8700 was followed by the dual-core PA-8800 processor, (almost) the end of the line for PA-RISC in 2004.


Used in


  1. A 900 MHz 2.25 MByte Cache with On Chip CPU (PDF, 119 KB) J. Michael Hill and Jonathan Lachman (2000: ISSCC)
  2. PA-RISC 2.0 Architecture (.pdf) Hewlett-Packard Company (1995)
  3. HP taps new foundry for PA-RISC processors, EE Times, August 2001

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