Horizon (TACC)
The NSF Leadership-Class Computing Facility system at TACC: 1,000 GB200 NVL4 nodes with 4,000 Blackwell GPUs, built by Dell, for US open science.
Horizon (TACC) is a partly operational GPU cluster run by Texas Advanced Computing Center (UT Austin, NSF) in Round Rock, Texas, United States. It has 4,000 NVIDIA GB200 (NVL4 nodes) GPUs installed.
Facts
Source per value- Owner / operator Organization that owns or operates the GPUs. Hosting and facility roles are listed under Partners.
- Texas Advanced Computing Center (UT Austin, NSF) 1
- GPU maker NVIDIA, AMD or Intel, taken from the GPU model.
- NVIDIA 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.
- NVIDIA GB200 (NVL4 nodes) 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.
- 4,000 1
- GPU count notes What the count covers (one partition, one site, a design limit), qualifiers and competing figures.
- 1,000 Grace Blackwell nodes × 4 Blackwell GPUs (TACC user guide). A separate Vera CPU partition has 4,752 nodes. 1
- Location City, region and country where the cluster sits. Empty when the operator does not name the site.
- Round Rock, Texas, 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
- Power notes Basis and date of the power figures, and who published them.
- Housed in a new 20 MW liquid-cooled data center (TACC). 1
- 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.
- partly operational 1
- Status notes The source’s wording on status, with the date.
- TACC’s user guide describes the GPU partition in the present tense; the Vera CPU partition follows. 1
- Interconnect Cluster network fabric.
- NVIDIA Quantum-X800 InfiniBand 1
- Compute nodes nodes Compute nodes in the system or partition.
- 1,000 1
- Cooling Cooling method where published.
- Liquid 1
Sources
- TACC: Horizon user guide accessed 2026-11-11
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