User`s manual

Introduction
Page 1-5
Hyper Pipelined Technology & 400/533MHz System Bus
Hyper Pipelined Technology doubles the pipeline depth the Pentium 4 delivers to
20 stages. This significantly increases the performance and frequency capabilities.
Pentium 4 also introduces a 400/533MHz system bus as opposed to the 100 and
133MHz bus seen in previous Pentium III processors. This allows 3.2Gbytes per
second of throughput while the Pentium III had a limited 1.06Gbyte/s throughput.
Willamette will reportedly be introduced in the 0.18-micron using aluminum.
Hyper-Threading Technology
Hyper-Threading Technology is a new features in the IA-32 Intel Architecture that
provides a performance boost for future Intel-32 processors based on the Intel
NetBurst
TM
micro architecture. This technology enables a single processor to run
two separate threads simultaneously, this arrangement looks like two processors.
Hyper-Threading Technology makes a single physical processor appear as multiple
logical processors, there is one copy of the architecture state for each logical
processor, and the logical processor share a single set of physical execution
resources. From a software or architecture perspective, this means operating
systems and user programs can schedule processors or threads to logical proces-
sors as they would on conventional physical processors in a multi-processor
system. From a micro architecture perspective , this means that instructions form
logical processors will persist and execute simultaneously on shared execution
resources.
For more information about all the new features the Pentium 4 delivers check
out the Intel website at http://www.intel.com