Yesterday, Intel launched its Xeon 6 family of server processors based on P-cores manufactured on Intel 3 node. While the early reviews seem promising, Intel is preparing a more advanced generation of processors that will make or break its product and foundry leadership. Codenamed "Clearwater Forest," these CPUs are expected to be the first high-volume production chips based on the Intel 18A node. We have pictures of the five-tile Clearwater Forest processor thanks to Tom's Hardware. During the Enterprise Tech Tour event in Portland, Oregon, Tom's Hardware managed to take a picture of the complex Clearwater Forest design. With compute logic built on 18A, this CPU uses Intel's 3-T process technology, which serves as the foundation for the base die, marking its debut in this role. Compute dies are stacked on this base die, making the CPU building more complex but more flexible.

The Foveros Direct 3D and EMIB technologies enable large-scale integration on a package, achieving capabilities that previous monolithic single-chip designs could not deliver. Other technologies like RibbonFET and PowerVia will also be present for Clearwater Forest. If everything continues to advance according to plan, we expect to see this next-generation CPU sometime next year. However, it is crucial to note that if this CPU shows that the high-volume production of Intel 18A is viable, many Intel Foundry customers would be reassured that Intel can compete with TSMC and Samsung in producing high-performance silicon on advanced nodes at scale.

Intel today announced that its lead products on Intel 18A, Panther Lake (AI PC client processor) and Clearwater Forest (server processor), are out of the fab and have powered-on and booted operating systems. These milestones were achieved less than two quarters after tape-out, with both products on track to start production in 2025. The company also announced that the first external customer is expected to tape out on Intel 18A in the first half of next year.

"We are pioneering multiple systems foundry technologies for the AI era and delivering a full stack of innovation that's essential to the next generation of products for Intel and our foundry customers. We are encouraged by our progress and are working closely with customers to bring Intel 18A to market in 2025." -Kevin O'Buckley, Intel senior vice president and general manager of Foundry Services

Intel Corporation today reported second-quarter 2024 financial results. "Our Q2 financial performance was disappointing, even as we hit key product and process technology milestones. Second-half trends are more challenging than we previously expected, and we are leveraging our new operating model to take decisive actions that will improve operating and capital efficiencies while accelerating our IDM 2.0 transformation," said Pat Gelsinger, Intel CEO. "These actions, combined with the launch of Intel 18A next year to regain process technology leadership, will strengthen our position in the market, improve our profitability and create shareholder value."

"Second-quarter results were impacted by gross margin headwinds from the accelerated ramp of our AI PC product, higher than typical charges related to non-core businesses and the impact from unused capacity," said David Zinsner, Intel CFO. "By implementing our spending reductions, we are taking proactive steps to improve our profits and strengthen our balance sheet. We expect these actions to meaningfully improve liquidity and reduce our debt balance while enabling us to make the right investments to drive long-term value for shareholders."

Pat Gelsinger—CEO of Intel Corporation—happily revealed late last month, during an earnings call: "Clearwater Forest, our first Intel 18A part for servers has already gone into fab and Panther Lake for clients will be heading into Fab shortly." The former is positioned as the natural successor to Team Blue's many-times-delayed Xeon "Sierra Forest" (all E-Core) processor family. Intel's second generation E-core Xeon "Clearwater Forest" design is expected to launch in 2025, with a deployment of "Darkmont" efficiency-oriented cores. Official product roadmaps and patch notes have revealed basic "Clearwater Forest" information, but we have not seen many leaks. Bionic_Squash has a history of releasing strictly internal Intel presentation slides—Meteor Lake (MTL-S) desktop SKUs were uncovered last April.

Their latest discovery does not include any photo or documented evidence—Bionic_Squash's concise social media post stated: "Clearwater Forest uses 3D stacking with hybrid bonding." This claim points to the possible deployment of Foveros Direct advanced packaging—this technology was expected to be ready at some point within the second half of 2023, although a mid-December technology showcase implied that things were behind schedule. The fanciest "Clearwater Forest" Xeon processors could arrive with a maximum total of 288 E-core count (and 288 threads)—according to Wccftech analysis: "The CPU package is going to consist of a base tile on top of the interposer which is connected through a high-speed I/O, EMIB, and the cores will be sitting on the topmost layer...Foveros Direct technology will allow direct copper-to-copper bonding, enabling low resistance interconnects and around 10-micron bump pitches. Intel itself states that Foveros Direct will blur the boundary between where the wafer ends and the package begins."

Intel presented its next generation Xeon "Clearwater Forest" processor family during September's Innovation Event—their roadmap slide (see below) included other Birch Stream platform architecture options. Earlier this week, Team Blue's software engineers issued a Linux kernel patch that contains details pertaining to codenamed projects: Sierra Forest, Grand Ridge and the aforementioned Clearwater Forest. All E-Core Xeon "Sierra Forest" processors are expected to launch around the middle of 2024—this deployment of purely efficiency-oriented "Sierra Glen" (Atom Crestmont) cores in enterprise/server chip form will be a first for Intel. The Sierra Forest Xeon range has been delayed a couple of times; but some extra maturation time has granted a jump from an initial maximum 144 E-Core count up to 288. The latest patch notes provide an early look into Clearwater Forest's basic foundations—it seems to be Sierra Forest's direct successor.

The Intel Xeon "Granite Rapids" processor family is expected to hit retail just after a Sierra Forest product launch, but the former sports a very different internal configuration—an all "Redwood Cove" P-Core setup. Phoronix posits that Sierra Forest's groundwork is clearing the way for its natural successor: "Clearwater Forest is Intel's second generation E-core Xeon...Clearwater Forest should ship in 2025 while the open-source Intel Linux engineers begin in their driver support preparations and other hardware enablement well in advance of launch. With engineers already pushing Sierra Forest code into the Linux kernel and related key open-source projects like Clang and GCC since last year, their work on enabling Sierra Forest appears to be largely wrapping up and in turn the enablement is to begin for Clearwater Forest. Sent out...was the first Linux kernel patch for Sierra Forest. As usual, for the first patch it's quite basic and is just adding in the new model number for Clearwater Forest CPUs. Clear Water Forest has a model number of 0xDD (221). The patch also reaffirms that the 0xDD Clearwater Forest CPUs are using Atom Darkmont cores."