Intel Pentium D 940 HH80553PG0884M 用户手册
产品代码
HH80553PG0884M
Datasheet
11
Introduction
1
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.