Coffee Lake

Coffee Lake. Coffee Lake is a codename for a family of 14 nanometer microprocessors developed by Intel, representing a significant iterative advancement within the company's Core product line. First launched in late 2017, it succeeded the Kaby Lake architecture and was notable for increasing core counts across the mainstream desktop and mobile segments. The family was produced using a refined version of Intel's long-serving 14 nm process and introduced new platform features alongside its performance-focused design.

Overview

The Coffee Lake microarchitecture was formally introduced by Intel in October 2017, marking the eighth generation of Intel Core processors. Its development and release occurred during a period of intensified competition with AMD and its new Zen-based Ryzen processors. A primary strategic response was to increase the core count for mainstream platforms, with desktop models moving from four to six cores and high-end mobile parts also receiving core additions. The launch encompassed new Intel 300 Series chipsets, requiring a new LGA 1151 socket that was not backward compatible with prior generations despite sharing the same physical design.

Architecture

Fundamentally, Coffee Lake is an optimization of the Skylake microarchitecture, sharing the same basic CPU core design and instruction set architecture including support for AVX-512 in certain configurations. The key architectural changes were implemented at the platform and die level rather than the core itself. Intel employed a refined "14nm++" manufacturing process, which allowed for higher transistor performance and clock speeds at a given voltage. The major architectural shift was the integration of more physical cores onto the die, necessitating a larger silicon die size and a redesigned uncore component to manage the increased core count and associated last-level cache.

Processor models

The Coffee Lake family spanned multiple market segments, each with distinct model series. The desktop lineup was led by the Core i7-8700K, a six-core part, while the Core i5-8600K and Core i3-8350K represented mainstream offerings. For the mobile market, Intel released both standard-voltage Core i9 and Core i7 parts for high-performance laptops and low-power U-series models for ultrabooks. The family also included Xeon E-2100 series processors for entry-level workstation and server markets, as well as Pentium Gold and Celeron branded chips for budget systems. Later refreshes, sometimes categorized separately as Coffee Lake Refresh, introduced higher core-count models like the Core i9-9900K.

Performance and reception

Upon release, Coffee Lake processors were generally praised for delivering substantial multi-threaded performance gains over Kaby Lake due to the increased core counts, with strong single-threaded performance maintained through high clock speeds. Reviewers from outlets like AnandTech, Tom's Hardware, and PCWorld noted the competitive pressure from AMD Ryzen had effectively pushed Intel to offer more cores in the mainstream segment. The new platform's lack of PCI Express 4.0 support and the socket incompatibility were noted as drawbacks. Overall, the family was seen as a successful, if evolutionary, response that maintained Intel's performance leadership in gaming and single-threaded applications at the time.

Platform and chipset

Coffee Lake processors were paired with the new Intel 300 Series chipsets, including the flagship Z370 and later the Z390. The Z370 chipset provided increased PCI Express lane connectivity from the Platform Controller Hub and native support for USB 3.1 Gen2. The platform supported DDR4 SDRAM memory, with official speeds increasing compared to prior generations. Despite using the same physical LGA 1151 socket as Skylake and Kaby Lake, electrical differences meant Coffee Lake CPUs were not compatible with older Intel 200 Series motherboards, a point of contention within the PC enthusiast community.

Successor and legacy

Coffee Lake was succeeded in the desktop market by Comet Lake, which further extended the 14nm process and core counts, and by the 10nm Ice Lake microarchitecture for mobile platforms. Its legacy is defined by breaking the long-standing quad-core convention for Intel's mainstream desktop CPUs, setting a new baseline that forced a re-evaluation of core counts across the entire x86 industry. The architecture solidified the core-count competition with AMD, influencing the design of subsequent generations like Rocket Lake and Alder Lake. Coffee Lake processors remained in production and popular for several years due to their strong performance and widespread adoption in systems from Dell, HP, Lenovo, and numerous system integrators. Category:Intel microprocessors Category:2017 in computing