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Intel Core™ microarchitecture

In 2006, Intel introduced the Core microarchitecture to extend the NetBurst microarchitecture features

and to add the energy efficient features of Intel's mobile microarchitecture. The Core microarchitecture

uses less power and produces less heat than previous generation Intel processors. The Core

microarchitecture features the following technologies that improve per-watt performance and energy

efficiency:

• Intel® Wide Dynamic Execution enables delivery of more instructions per clock cycle to improve

execution time and energy efficiency.

• Intel® Intelligent Power Capability reduces power consumption and design requirements.

• Intel® Smart Memory Access improves system performance by optimizing the use of the available

data bandwidth from the memory subsystem.

• Intel® Advanced Smart Cache is optimized for multi-core and two-core processors to reduce latency

to frequently used data, providing a higher-performance, more efficient cache subsystem.

• Intel® Advanced Digital Media Boost improves performance when executing SSE, SSE2, and SSE3

instructions. This technology accelerates a broad range of encryption, financial, engineering, and

scientific applications.

• Streaming SIMD Extensions 4 (SSE4) instructions consist of 54 instructions that enhance video,

graphics, and high-performance applications. These instructions are divided into two major

categories—Vectorizing Compiler and Media Accelerators, and Efficient Accelerated String and

Text Processing.

Processors

The two-core Intel Xeon 3000 and 5000 Sequence and the 7300 series processors are based on the

Core microarchitecture. Using Hyper-Threading technology, two-core processors (with the exception of

the Xeon 3000 Sequence processors) can simultaneously execute four software threads, thereby

increasing processor utilization. To avoid saturation of the Front Side Bus (FSB), the Intel 5000 chipset

widens the interface by providing dual independent buses. The Xeon 7300 series processors

introduce an independent point-to-point interface between the chipset and each processor that allows

full front-side-bus bandwidth.

Xeon two-core processors

The 64-bit Intel Xeon 3000 Sequence processors combine performance and power efficiency to

enable smaller, quieter systems. Xeon 3000 Sequence processors run at a maximum frequency of

2.66 gigahertz (GHz), with 4 megabytes (MB) of shared L2 cache (Figure 7 left) and a maximum

front-side bus speed of 1066 megahertz. These processors are compatible with IA-32 software and

support single-processor operation. Xeon 3000 Sequence processors use the Intel 3000 or 3010

chipsets which support Error Correction Code (ECC) memory for a high level of data integrity,

reliability, and system uptime. ECC can detect multiple-bit memory errors and locate and correct

single-bit errors to keep business applications running smoothly.

The 64-bit Intel Xeon 5000 Sequence processors have two complete processor cores, including

caches, buses, and execution states. The Xeon 5000 Sequence processors run at a maximum

frequency of 3.73 GHz, with 2 MB of L2 cache per core. The processor supports maximum front-side

bus speeds of 1066 megahertz (Figure 7 center).