Intel Pentium D 945 HH80553PG0964MN User Manual

Product codes

HH80553PG0964MN

Datasheet

Introduction

The Intel

Pentium

D processor 900 sequence and Intel

Pentium

processor

Extreme Edition 955, 965 are Intel’s first desktop dual-core products on the 65 nm

process. The processors use Flip-Chip Land Grid Array (FC-LGA6) package technology,

and plug into the LGA775 socket. The Pentium D processor 900 sequence and Pentium

processor Extreme Edition 955, 965, like the Intel

Pentium

D processor on 90 nm

process in the 775-land LGA package, use the Intel NetBurst

microarchitecture and

maintains the tradition of compatibly with IA-32 software.

Note:

In this document, unless otherwise specified, the Intel

Pentium

D processor 900

sequence refers to Intel Pentium D processors 960, 950, 945, 940, 935, 930, 925, 920,

and 915.

Note:

In this document the Intel Pentium D processor 900 sequence on 65 nm process in the

775-land LGA package and the Intel Pentium processor Extreme Edition 955, 965 on

65 nm process in the 775-land LGA package are referred to simply as “processor.”

The processor functions as two physical processors in one package. This allows a

duplication of execution resources to provide increased system responsiveness in

multitasking environments, and headroom for next generation multithreaded

applications and new usages.

The processor supports all the existing Streaming SIMD Extensions 2 (SSE2) and

Streaming SIMD Extensions 3 (SSE3). Streaming SIMD Extensions 3 (SSE3) are 13

additional instructions that further extend the capabilities of Intel processor technology.

These new instructions enhance the performance of optimized applications for the

digital home such as video, image processing, and media compression technology.

The processor supports the Intel

64 architecture as an enhancement to Intel's IA-32

architecture. This enhancement allows the processor to execute operating systems and

applications written to take advantage of the Intel 64 architecture. Further details on

the 64-bit extension architecture and programming model can be found in the Intel

Extended Memory 64 Technology Software Developer Guide at http://

developer.intel.com/technology/64bitextensions/.

The processor’s Intel NetBurst

microarchitecture front side bus (FSB) uses a split-

transaction, deferred reply protocol like the Intel

Pentium

4 processor. 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 6.4 GB/s (800 MHz FSB) or 8.5 GB/s (1066 MHz FSB).

Intel will enable support components for the 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 processor also includes the Execute Disable Bit capability. 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

Architecture Software Developer's Manual for

more detailed information.