Intel Xeon 7 Diamond Rapids: 256 cores for servers - deep dive into Intel's silicon monster

Intel has just unveiled the Xeon 7 Diamond Rapids, its new generation of server processors that scales up to 256 cores. The Register has published a complete deep dive. Sora breaks down the specs, performance, and what this behemoth means for data centers—and for AMD EPYC, which dominates this segment.

Design / Architecture

The Diamond Rapids is the Xeon Scalable generation that succeeds Granite Rapids (2024). Intel is returning to an ambitious architecture after years of challenges against AMD EPYC.

256 cores, but how? The Diamond Rapids in its maximum configuration reaches 256 cores via a multi-tile (chiplet) design connected by Intel's EMIB (Embedded Multi-die Interconnect Bridge) technology. This is not 256 cores on a single monolithic die—Intel assembles multiple compute, cache, and I/O tiles on the same package.

Manufacturing node. The Diamond Rapids is manufactured on Intel 18A (Intel's internal process node, roughly equivalent to 2 nm from external foundries). This is the first Xeon generation to benefit from the Intel 18A node after months of communication about its industrial maturity.

Memory. Supports DDR5 with very high capacities per socket—high-end server configurations allow several terabytes of RAM per node. Memory bandwidth per core remains a critical point in this type of architecture with a very high core count.

Adoption / Positioning

The Diamond Rapids is not aimed at workstations or PCs—it is exclusively a server processor for enterprise workloads and data centers:

• HPC (High Performance Computing): simulation, modeling, scientific computing
• In-memory databases at very large scale
• AI inference: the high core count and memory bandwidth are assets for serving language models in production
• Dense virtualization: 256 cores per socket = many VMs per physical node

Performance

The Register reports results that Intel presents as superior to AMD EPYC Genoa on certain core-count-bound workloads, particularly in SPECrate benchmarks and database workloads.

But beware of Intel's angle: benchmarks presented by the vendor during announcements are always carefully selected. Independent comparisons with AMD EPYC Turin (the current AMD generation with up to 192 cores) and upcoming EPYC parts are gradually emerging. Initial data from OEM partners confirms competitive performance, without a clear dominance.

Note: some Intel 18A specs not yet officially confirmed at the time of writing.

Power Efficiency / Consumption

With 256 cores, the TDP (Thermal Design Power—the nominal thermal power to dissipate) is considerable. Intel has not yet published an official figure at the time of writing, but market estimates place it around 500 W per socket under maximum load—about 1 kW for a standard dual-socket configuration.

This is a critical parameter for data centers: more power consumption = more cooling = higher operational costs. AMD EPYC has long had an advantage in energy efficiency per core thanks to the TSMC 3 nm node. The Intel 18A node should close part of this gap.

Verdict

Intel Diamond Rapids is a strong signal: Intel 18A is mature enough to produce chips at very large scale, and Intel can once again compete in the server segment that AMD has dominated since 2019–2020.

The real test will be independent benchmarks from OEMs (Dell, HPE, Lenovo) and hyperscalers. If Intel 18A delivers on its promises in production, Diamond Rapids could mark the return of real competition in this segment—which is good news for buyers.