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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:

In this document, unless otherwise specified, the Intel® Pentium® 4 processor 6x1

sequence refers to Intel Pentium 4 processors 661, 651, 641, 631.

Note:

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 Technology1. 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 Section 6.1 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.

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