Pentium® II Processor
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Intel® Pentium® II Processor
Product overview
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The Pentium® II processor at 450 MHz, Intel's high performance desktop processor, integrates the best attributes of the P6 microarchitecture processors—Dynamic Execution performance, a multi-transaction system bus, plus Intel’s MMX™ media enhancement technology. Pentium II processors are targeted for professionals, avid PC users, and PC gamers, or the Enthusiast/Professional desktop users. In addition, they are targeted for mainstream home and business users, or the Performance desktop PC market. The Pentium II processor also meets the needs of entry-level servers and workstations.
The Intel Pentium II processors deliver excellent performance for all PC software and are fully compatible with existing Intel Architecture-based software. The latest Pentium II processor, at 450 MHz, extends processing power further by offering performance headroom for business media, communication and Internet capabilities. Software designed for Intel’s MMX technology unleashes the full multimedia capabilities of these processors including full-screen, full-motion video, enhanced color, and realistic graphics. The Pentium II processor brings excitement to your PC experience. Systems based on Pentium II processors also include the latest features to simplify system management and lower the total cost of ownership for large and small business environments. The Pentium® II processor offers great performance for today's and tomorrow's applications.
Product Highlights
Available in speeds from 233 MHz up to 450 MHz.
Utilizes Intel’s 0.25 micron manufacturing process for increased processor core frequencies and reduced power consumption.
Includes MMX media enhancement technology.
The Pentium® II processor at 450 MHz delivers 32% more integer performance (as measured by SPECint95), 30% more multimedia performance (as measured by Norton Media Benchmark), and 35% more floating point performance (as measured by SPECfp95) than the 333 MHz Pentium® II processor.
Dual Independent Bus (DIB) architecture increases bandwidth and performance over single-bus processors.
450, 400, and 350 MHz versions improve system bandwidth and performance by increasing the system bus speed from 66 MHz to 100 MHz. The Intel® 440BX AGP set enables the 100 MHz system bus to increase peak processor data transfers to the rest of the system by 50%.
Single Edge Contact (SEC) cartridge packaging technology delivers high-performance processing and bus technology to mainstream systems.
32K (16K/16K) non-blocking, level-one cache provides fast access to heavily used data.
512K unified, non-blocking, level-two cache.
450, 400, and 350 MHz versions support memory cacheability for up to 4GB of addressable memory space.
Enables scalable systems to be expanded to two processors and 64GB of physical memory.
Includes data integrity and reliability features such as Error Correction Code (ECC), Fault Analysis, Recovery, and Functional Redundancy Checking for both system and L2 cache buses.
Product Description

The Intel Pentium II processor family includes 233 MHz, 266 MHz, 300 MHz, 333 MHz, 350 MHz, 400 MHz, and now 450 MHz versions for desktops, workstations, and servers. All are binary compatible with previous generation Intel-Architecture processors. Pentium II processors provide Intel's highest level of desktop performance for applications running on advanced operating systems such as Windows* 95*, Windows* 98*, Windows NT*, and UNIX*. The innovative 0.25 manufacturing process enables these CPUs to include over 7.5 million transistors—resulting in more power in less space. The processor core is packaged in the Single Edge Contact (SEC) cartridge enabling ease of design and flexible motherboard architecture.

The Pentium II processor family’s significant performance improvement over previous Intel-Architecture processors is based on the seamless combination of the P6 microarchitecture and Intel MMX media enhancement technology. The result is higher software performance plus headroom for applications that take advantage of Intel MMX technology.

P6 Microarchitecture Dynamic Execution Technology

Multiple Branch Prediction: Predicts program execution through several branches, accelerating the flow of work to the processor.

Dataflow Analysis: Creates an optimized, reordered schedule of instructions by analyzing data dependencies between instructions.

Speculative Execution: Carries out instructions speculatively and based on this optimized schedule, ensures that the processor’s superscalar execution units remain busy, boosting overall performance.

Intel® MMX™ Media Enhancement Technology

Intel MMX technology includes new instructions and data types that allow applications to achieve a new level of performance. Intel MMX technology is designed as a set of basic, general-purpose integer instructions that are easily applied to the needs of a wide diversity of multimedia and communications applications. The highlights of the technology are:

Single Instruction, Multiple Data (SIMD) technique
57 new instructions
Eight 64-bit wide MMX technology registers
Four new data types
Other Significant Features
SEC cartridge packaging, developed by Intel, enables high-volume availability, improved handling protection, and a common form factor for future high-performance processors.
High-performance Dual Independent Bus (DIB) architecture (system bus and cache bus) for high bandwidth, performance and scalability with future system technologies.
The system bus supports multiple outstanding transactions to increase bandwidth availability. It also provides “glueless” support for up to two processors. This enables low-cost, two-way symmetric multiprocessing, providing a significant performance boost for multitasking operating systems and multi-threaded applications.
A 512K unified, non-blocking, level-two cache that improves performance by reducing the average memory access time and providing fast access to recently used instructions and data. Performance is enhanced through a dedicated 64-bit cache bus. The speed of the level-two cache scales with the processor core frequency. This processor also incorporates separate 16K level-one caches, one for instructions and one for data.
450, 400, and 350 MHz supports memory cacheability for up to 4GB of addressable memory space.
Available with ECC (Error Correction Code) functionality on the level-two cache bus for applications where data intensity and reliability are essential.
A pipelined Floating-Point Unit (FPU) for supporting the 32-bit and 64-bit formats specified in IEEE standard 754, as well as an 80-bit format.
Parity-protected address/request and response system bus signals with a retry mechanism for high data integrity and reliability.
Testing and Performance Monitoring Features
Built-in Self Test (BIST) provides single stuck-at fault coverage of the microcode and large logic arrays, as well as testing of the instruction cache, data cache, Translation Lookaside Buffers (TLBs) and ROMs.
IEEE 1149.1 Standard Test Access Port and Boundary Scan mechanism enables testing of the Pentium II processor and system connections through a standard interface.
Internal performance counters for performance monitoring and event counting.
Incorporates an on-die diode that can be used to monitor the die the die temperature of the Pentium II processor for thermal management purposes.
Performance Specifications
Frequency (MHz) Cache Size (K) SPECint*95 SPECfp*95 Intel Media Benchmark iCOMP* index 2.0
233 (1) 512 9.38 8.17 364.13 267
266 (1) 512 10.7 8.17 412.31 303
300 (1) 512 11.9 8.82 459.08 332
333 (1) 512 13.0 9.55 498.79 366
350 (1) 512 13.9 11.20 534.61 386
400 (1) 512 15.8 12.40 601.10 440
450 (1) 512 17.2 12.90 658.41 483

The Pentium® II processor may contain design defects or errors known as errata. Current characterized errata are available upon request.

Note: 1NON-ECC level-two cache.
Source for performance data: Pentium® II Processor Performance Brief, August 1998 (243336-006).
System Configuration: Intel® Seattle 82440BX AGPset Based mother board, 32 MB SDRAM, Seagate
ST34501W* SCSI disk, Matrox Millenium II* AGP-based video card, SPECint95 and SPECfp95 results based on Windows NT 4.0; all others based on Windows 95.
Celeron and MMX are trademarks of Intel Corporation. Intel, Pentium, and iCOMP are registered trademarks of Intel Corporation

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