Next Generation Intel® Processor: Software Developers Guide


This guide discusses the Intel® Pentium® 4 processor with Hyper-Threading Technology (code named Prescott).

Prescott is the code name for a new generation of IA32 processors. The technology incorporates an enhanced Intel® NetBurst® microarchitecture. Other features include:

  • Support for Hyper-Threading (HT) Technology
  • Prescott New Instructions (PNI)
  • Deeper pipelining to enable higher frequency
  • A High-speed System Bus


Prescott improves on the Pentium® 4 processor's hyper-pipelined technology to achieve even higher clock rates than previous generations of Pentium 4 processors. At the same time, the new processor has larger first-level and second-level caches, more store buffers, write-combining buffers.

Support for PNI does not require new OS support for saving and restoring the new state during a context switch, beyond that provided for Streaming SIMD Extensions. The instruction set is compatible with all software written for Intel® architecture microprocessors.

Additional Resources

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