Ivy Bridge (microarchitecture)

Ivy Bridge (microarchitecture)
Name	Ivy Bridge
Produced-start	April 2012
Produced-end	2013
Slowest	1.4
Slow-unit	GHz
Fastest	3.9
Fast-unit	GHz
Size-from	22 nm
Arch	x86-64
Sock1	LGA 1155
Sock2	PGA 988
Sock3	BGA-1023
Sock4	BGA-1224
Sock5	LGA 2011
Predecessor	Sandy Bridge
Successor	Haswell

Ivy Bridge (microarchitecture) is a codename for a CPU microarchitecture developed by Intel as the successor to its Sandy Bridge design. First launched in April 2012, it was the first high-volume processor to be manufactured using a 22-nanometer process and introduced the revolutionary 3D Tri-Gate transistors. The architecture brought significant improvements in integrated graphics performance, power efficiency, and overall performance per watt, while maintaining socket compatibility with many existing LGA 1155 platforms.

Overview

Ivy Bridge represented a "tick" in Intel's established tick-tock manufacturing and design model, focusing primarily on a die shrink and process technology advancement. It succeeded the highly successful Sandy Bridge microarchitecture and was officially unveiled at the Intel Developer Forum. The primary product lines utilizing this architecture included the third-generation Core i3, i5, and i7 processors for mainstream desktops and laptops, as well as new Xeon server chips. While maintaining the fundamental CPU core design of its predecessor, Ivy Bridge's major leap was its transition to a 22 nm manufacturing process, a critical step that enabled greater transistor density and improved energy efficiency across the entire product stack.

Features and improvements

The most significant technological advancement in Ivy Bridge was the introduction of 3D Tri-Gate (FinFET) transistors, a first for high-volume CPU production. This allowed for lower operating voltages and substantially reduced power consumption and heat output. The integrated GPU, now branded as Intel HD Graphics 4000/2500, featured up to 16 execution units, a major increase from Sandy Bridge, delivering markedly better performance in DirectX 11 and OpenGL applications. Other enhancements included native support for USB 3.0, PCI Express 3.0, and more robust security features via Intel Identity Protection Technology. The architecture also introduced new instructions as part of the AVX instruction set, improving performance in floating-point intensive workloads.

Processor models

Ivy Bridge processors were launched under the Intel Core brand for client computing, spanning the Core i3, Core i5, and Core i7 families for both desktop and mobile segments. Key desktop models included the quad-core Core i7-3770K, a popular unlocked part for enthusiasts, and the Core i5-3570K. For the mobile market, Ivy Bridge powered the third-generation Core i7-3xxxQM series quad-core processors and a wide range of ultra-low-voltage (ULV) dual-core chips for ultrabooks. The architecture also extended to the server and workstation market with the Ivy Bridge-EP-based Xeon E5-family processors for the LGA 2011 platform and the Xeon E3-v2 series for single-socket servers.

Architecture

At its core, the Ivy Bridge CPU architecture retained the same basic layout as Sandy Bridge, featuring an integrated memory controller supporting DDR3 and DDR3L memory, a shared L3 cache (Smart Cache), and the Ring Bus interconnect. The microarchitecture itself, known as the P6 microarchitecture derivative, maintained the same pipeline design, out-of-order execution engine, and Hyper-Threading implementation. The major architectural changes were concentrated in the uncore components, including the upgraded integrated graphics processor (IGP) and the new Platform Controller Hub (PCH) that provided the native USB 3.0 and PCI Express 3.0 connectivity.

Manufacturing process

Ivy Bridge was manufactured using Intel's pioneering 22 nm process node, a critical shrink from the 32 nm process used for Sandy Bridge. This was the first commercial use of 3D Tri-Gate transistor technology, which allowed transistors to be packed more densely and operate with greater efficiency at lower voltages. The process was developed at Intel's advanced D1D/D1X fabrication facilities in Hillsboro, Oregon. The transition to 22 nm was not without challenges, contributing to some initial supply constraints and higher-than-expected thermal characteristics in certain overclocked desktop parts, a phenomenon often referred to in enthusiast circles.

Reception and impact

Upon release, Ivy Bridge was generally praised by reviewers and industry analysts for its substantial improvements in integrated graphics performance and excellent power efficiency, which were crucial for the burgeoning ultrabook market championed by Intel. It solidified Intel's process technology leadership over rivals like AMD and its Bulldozer architecture. The architecture's efficiency made it a staple in laptops and all-in-one PCs for several years. While its desktop performance gains over Sandy Bridge were more modest, its technological significance as the vanguard of 3D transistor technology set the stage for subsequent generations like Haswell and cemented key industry standards like USB 3.0 and PCI Express 3.0 in the mainstream.

Category:Intel microprocessors Category:X86 microarchitectures Category:2012 in computing