Lux (ORNL)

DOE’s AMD AI cluster at Oak Ridge: more than 4,000 Instinct MI355X GPUs in 500+ nodes on Ultra Ethernet, open to science and industry users.

Lux (ORNL) is an under-construction GPU cluster run by Oak Ridge National Laboratory (DOE) in Oak Ridge, Tennessee, United States. 4,000 AMD Instinct MI355X, 288 GB HBM3E GPUs are planned; no installed count is published.

Supercomputer

Verified 11 Nov 2026

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Facts

Source per value

Owner / operator Organization that owns or operates the GPUs. Hosting and facility roles are listed under Partners.: Oak Ridge National Laboratory (DOE) 1
GPU maker NVIDIA, AMD or Intel, taken from the GPU model.: AMD 1
GPU model Accelerator model or family as disclosed. A GH200 is one GPU on a superchip; an MI300A is an APU that contains a GPU.: AMD Instinct MI355X, 288 GB HBM3E 1
GPUs installed Physical GPUs in the cluster, from the operator or a deterministic sum of disclosed quantities (nodes × GPUs per node). Planned counts, H100-equivalents and unaudited press totals are never counted here.: Not published
GPUs planned Announced, contracted or target GPU count. Not evidence that the GPUs are installed.: 4,000 1
GPU count notes What the count covers (one partition, one site, a design limit), qualifiers and competing figures.: OLCF: “4,000+ GPUs” in “500+ nodes”; full-system jobs may use fewer than 4,000. 1
Location City, region and country where the cluster sits. Empty when the operator does not name the site.: Oak Ridge, Tennessee, United States 1
Country Country of the cluster, taken from the location.: United States 1
Live power MW Power in service, in megawatts of IT load where the source says so. Company figures are marked in the notes; Epoch AI satellite estimates are labelled as estimates.: Not published
Status operational = running and named as such by the operator or a primary source; partly operational = a phase is live and more is coming; under construction = building underway; announced = disclosed or contracted with no confirmed go-live.: under construction 1
Status notes The source’s wording on status, with the date.: Installation under way in OLCF photos dated 17 Jul 2026; no go-live announced as of 11 Nov 2026. 1
Interconnect Cluster network fabric.: Ultra Ethernet, one 400G NIC per GPU 1
Compute nodes nodes Compute nodes in the system or partition.: 500 1

Sources

OLCF: Lux accessed 2026-11-11

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