Introduction
1
Introduction
The Intel
®
Pentium
®
4 processors 6x1 sequence are the first single-core desktop
processors on the 65 nm process. The Pentium 4 processor uses Flip-Chip Land Grid
Array (FC-LGA6) package technology, and plugs into a 775-land surface mount, Land
Grid Array (LGA) socket, referred to as the LGA775 socket.
Note:
Note:
In this document, unless otherwise specified, the Intel
®
Pentium
®
4 processor 6x1
sequence refers to Intel Pentium 4 processors 661, 651, 641, 631.
In this document the Intel
®
Pentium
®
4 processor 6x1 sequence on 65 nm process in
the 775-land package will be referred to as the “Pentium 4 processor,” or simply “the
processor.”
The Pentium 4 processor supports Intel
®
64 architecture. This enhancement allows the
processor to execute operating systems and applications written to take advantage of
Intel 64 architecture. Further details on the 64-bit extension architecture and
programming model are in the
Intel
®
Extended Memory 64 Technology Software
Developer Guide
at http://developer.intel.com/technology/64bitextensions/.
The Pentium 4 processor supports Hyper-Threading Technology
1
. Hyper-Threading
Technology allows a single, physical processor to function as two logical processors.
While some execution resources such as caches, execution units, and buses are shared,
each logical processor has its own architecture state with its own set of general-
purpose registers and control registers to provide increased system responsiveness in
multitasking environments and headroom for next generation multithreaded
applications. Intel recommends enabling Hyper-Threading Technology with Microsoft
Windows* XP Professional or Windows* XP Home, and disabling Hyper-Threading
Technology via the BIOS for all previous versions of Windows operating systems. For
more information on Hyper-Threading Technology, see http://www.intel.com/products/
ht/hyperthreading_more.htm. Refer to
for Hyper-Threading Technology
configuration details.
The Pentium 4 processor’s Intel NetBurst
®
microarchitecture front side bus (FSB) uses
a split-transaction, deferred reply protocol like previous Intel
®
Pentium
®
4 processors.
The Intel NetBurst microarchitecture FSB uses Source-Synchronous Transfer (SST) of
address and data to improve performance by transferring data four times per bus clock
(4X data transfer rate, as in AGP 4X). Along with the 4X data bus, the address bus can
deliver addresses two times per bus clock and is referred to as a “double-clocked” or 2X
address bus. Working together, the 4X data bus and 2X address bus provide a data bus
bandwidth of up to 8.5 GB/s.
Intel will enable support components for the Pentium 4 processor including heatsink,
heatsink retention mechanism, and socket. Manufacturability is a high priority; hence,
mechanical assembly may be completed from the top of the baseboard and should not
require any special tooling.
The Pentium 4 processor also include the Execute Disable Bit capability previously
available in Intel
®
Itanium
®
processors. This feature, combined with a supported
operating system, allows memory to be marked as executable or non-executable. If
code attempts to run in non-executable memory the processor raises an error to the
operating system. This feature can prevent some classes of viruses or worms that
exploit buffer over run vulnerabilities and can thus help improve the overall security of
the system. See the
Intel
®
64 and IA-32 Architecture Software Developer’s Manual
for
more detailed information.
Datasheet
9
INTEL [ INTEL CORPORATION ]
