Intel 521 Data Sheet - Page 11

1 Introduction Introduction The Intel® Pentium® 4 processor on 90 nm process in the 775-land package is a follow on to the Pentium 4 processor in the 478-pin package with enhancements to the Intel NetBurst® microarchitecture. The Pentium 4 processor on 90 nm process in the 775-land package uses FlipChip Land Grid Array (FC-LGA4) package technology, and plugs into a 775LGA socket. The Pentium 4 processor in the 775-land package, like its predecessor, the Pentium 4 processor in the 478-pin package, is based on the same Intel 32-bit microarchitecture and maintains the tradition of compatibility with IA-32 software. Note: In this document the Pentium 4 processor on 90 nm process in the 775-land package is also referred to as the processor. The Pentium 4 processor on 90 nm process in the 775-land package 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, 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/info/hyperthreading. Refer to Section 6.1, for Hyper-Threading Technology configuration details. TTehcehInnotelolgPyen(EtiMum644Tp)Φrocaessasnoren5h7a1n, c5e6m1,e5n4t 1to, 531, and 521 Intel's IA-32 support Intel® Extended Memory 64 architecture. This enhancement enables the processor to execute operating systems and applications written to take advantage of Intel EM64T. With appropriate 64 bit supporting hardware and software, platforms based on an Intel processor supporting Intel® EM64T can enable use of extended virtual and physical memory. Further details on the 64-bit extension architecture and programming model is provided in the Intel® Extended Memory 64 Technology Software Developer Guide at: http://developer.intel.com/ technology/64bitextensions/. In addition to supporting all the existing Streaming SIMD Extensions 2 (SSE2), there are 13 new instructions that further extend the capabilities of Intel processor technology. These new instructions are called Streaming SIMD Extensions 3 (SSE3). These new instructions enhance the performance of optimized applications for the digital home such as video, image processing, and media compression technology. 3D graphics and other entertainment applications such as gaming will have the opportunity to take advantage of these new instructions as platforms with the Pentium 4 processor in the 775-land package and SSE3 become available in the market place. The processor's Intel NetBurst microarchitecture FSB uses a split-transaction, deferred reply protocol like the Pentium 4 processor. The Intel NetBurst microarchitecture FSB uses SourceSynchronous 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. Datasheet 11