Haswell

Haswell. Haswell is the codename for a microprocessor architecture developed by Intel as the successor to its Ivy Bridge design. First launched in mid-2013, it was a "tick-tock" model "tock," representing a significant architectural redesign on an existing manufacturing process. The architecture was implemented in processors for a wide range of computing platforms, including desktops, notebooks, and servers.

Architecture and design

The microarchitecture introduced several major innovations focused on improving performance-per-watt and integrated capabilities. A key design goal was enhancing energy efficiency for the growing ultrabook and 2-in-1 PC market segments. The architecture featured a new instruction set extension known as AVX2, which doubled the width of integer vector operations and introduced new instructions like gather operations. It also integrated a fully on-die voltage regulator (FIVR), a significant change that moved critical power delivery components from the motherboard to the processor die itself. The integrated graphics subsystem, branded as Intel HD Graphics, saw a substantial redesign with support for Direct3D 11.1 and OpenGL 4.3, alongside improved execution units. New low-power states, such as the S0ix "active idle" state, were implemented to dramatically reduce power consumption during periods of light activity, a feature crucial for mobile devices. The design also expanded support for DDR4 memory in certain server and high-end desktop variants launched later in its lifecycle.

Performance and reception

General CPU performance showed a modest generational improvement in traditional workloads, with typical gains cited between 5-10% over the preceding Ivy Bridge at the same clock speeds. The most notable performance leaps were observed in the integrated graphics performance, with the top-tier Iris Pro Graphics configurations offering a substantial improvement, making them suitable for light gaming and multimedia tasks. The implementation of AVX2 provided significant acceleration for supported scientific and multimedia applications. Critical reception from outlets like AnandTech and Tom's Hardware praised the architectural efficiency and the strong integrated graphics, but some reviewers noted that the desktop performance uplift was less dramatic than in previous generations. The FIVR design was a point of discussion, as it increased the thermal design power of the die but offered motherboard designers greater simplicity.

Variants and models

The architecture was deployed across a wide spectrum of product lines and sockets. For the desktop market, it was sold under the Core i3, Core i5, Core i7, and the enthusiast Core i7 Extreme Edition brands, utilizing the LGA 1150 socket and the Intel 8 Series chipset family, including the Z87 and H87. Mobile processors spanned from ultra-low-power Y-series chips for fanless designs to high-performance quad-core M-series and QM-series parts for gaming laptops. The server segment was represented by the Xeon E3 and Xeon E5 families, with the latter introducing the LGA 2011-3 socket. A notable variant was the Crystal Well line, which featured an on-package eDRAM cache acting as a Level 4 cache to dramatically boost graphics and memory-bound performance, primarily found in certain high-end mobile and Apple desktop systems.

Manufacturing and process technology

Haswell was manufactured using Intel's refined 22 nanometer process technology, the same tri-gate FinFET (marketed as 3D transistors) process first introduced for Ivy Bridge. This process maturity allowed for higher transistor density and more optimized power characteristics compared to the initial 22nm production. The architecture was not a process shrink (a "tick" in Intel's model), but rather an architectural evolution on the established node. The integration of the FIVR represented a major change in the physical design and packaging, incorporating power delivery components that were traditionally part of the motherboard's voltage regulator module directly onto the processor silicon.

Market impact and legacy

The architecture solidified Intel's focus on power efficiency and heterogeneous computing, strongly influencing the design of future SoC-like products. Its energy-efficient features were instrumental in enabling thinner, lighter, and longer-battery-life devices, competing directly with ARM-based platforms in the mobile space. Haswell-based systems remained in the market for an extended period and formed a long-lasting platform, particularly in the corporate environment with products like the Dell OptiPlex and Lenovo ThinkCentre lines. Its direct successor, Broadwell, was a "tick" or die shrink to 14nm, but faced manufacturing delays, which extended Haswell's relevance and market lifespan. The architecture's design principles, especially its emphasis on integrated graphics performance and advanced power management, were directly carried forward into subsequent microarchitectures like Skylake.

Category:Intel microprocessors Category:2013 in computing