Clearwater Forest Xeon 6+ Reaches Mass Production on Intel 18A
Intel’s Clearwater Forest Xeon 6+ has officially moved into full mass production on the Intel 18A process, clearing a major hurdle on the path to launch later this year. As one of the first large-scale data center products on 18A, Clearwater Forest is a showcase for Intel’s next-generation manufacturing and packaging stack. The platform targets dense, highly parallel workloads such as 6G infrastructure and edge AI services, where thread count, power efficiency, and memory bandwidth are critical. Intel has also aligned its oneAPI 2026.0 toolkit to fully support the new E-core server CPU, alongside future products like Crescent Island, Nova Lake, and Diamond Rapids. For enterprise buyers, this production milestone is significant: it signals that Clearwater Forest is no longer a roadmap slide but a concrete data center processor preparing for deployment in real-world environments.
288 Darkmont E-Cores and 576 MB Cache: Built for Massive Parallelism
At the heart of Clearwater Forest Xeon is the Darkmont E-core architecture, scaled up to 288 cores across 12 compute chiplets. This design is backed by 576 MB of on-package L3 cache and 288 MB of L2 cache, a combination aimed at feeding hundreds of threads with minimal contention. Intel combines several key technologies—RibbonFET transistors, PowerVia backside power delivery, Foveros Direct 3D stacking, and EMIB 2.5D interconnect—to link these chiplets into a cohesive, high-bandwidth compute fabric. The result is an E-core server CPU optimized for throughput workloads where sheer core count and cache capacity drive performance, such as microservices, cloud-native databases, and telco network functions. With a TDP envelope up to 450W and support for LGA 7529 in 1-socket and 2-socket configurations, Clearwater Forest is positioned as a dense, scalable workhorse for modern data center racks.
Platform I/O, Memory, and Power Efficiency for Data Center Scale
Clearwater Forest-based platforms are designed to remove bottlenecks beyond the CPU cores themselves. The Xeon 6+ supports up to 12-channel DDR5 memory at speeds up to 8000 MT/s, providing substantial bandwidth to keep 288 E-cores busy. On the I/O front, systems can leverage up to 6 UPI 2.0 links running at up to 24 GT/s per lane for multi-socket and cluster connectivity. For accelerator and storage-heavy deployments, the platform exposes up to 96 PCIe Gen 5.0 lanes and up to 64 CXL 2.0 lanes, enabling high-speed links to GPUs, DPUs, and next-generation memory devices. In Ericsson testing, a single Xeon 6990E+ Clearwater Forest processor with 288 cores delivered a 38% reduction in rack runtime power, more than 60% better performance per watt, and 30% higher overall performance versus a dual-socket Xeon 6780E Sierra Forest system with the same core count.
Strategic Shift to High-Core-Count E-Cores Against EPYC and Beyond
Clearwater Forest illustrates Intel’s strategic pivot toward high-core-count E-core designs to compete in the segment dominated by dense server CPUs like AMD’s EPYC. Instead of relying solely on large P-cores, Intel is embracing E-cores as the foundation for cloud and edge infrastructure, where efficiency and thread density can outweigh single-thread peak performance. The Xeon 6+ line is part of a broader roadmap that also includes Diamond Rapids P-core processors, which are expected to reach up to 256 cores initially and scale to 512 cores with 16-channel memory in denser variants. While Diamond Rapids targets a later timeframe, Clearwater Forest’s imminent launch gives Intel an earlier answer in the efficiency-focused tier. With Intel 18A process technology and oneAPI support in place, enterprises evaluating next-generation data center processor options can now factor Clearwater Forest into their near-term deployment and migration plans.