Supercomputers/Systems/Longhorn
USA · operational · mixed
Longhorn
Operated by Texas Advanced Computing Center at Texas Advanced Computing Center .
Phase 1 seed dataset, compiled by hand. These rows were built from public operator, laboratory and vendor sources. A mechanical second-reader pass has since fetched every cited source: 1092 of 1153 systems have a readable citation that names them, and 40 are genuinely weakly sourced. Every claim carries its source and a confidence tier. Treat anything below verified as a lead, not a citation.
Measured performance
- Rmax
- 2.29 PFlop/s
- Rpeak
- 2.87 PFlop/s
- Rmax ÷ Rpeak
- 79.8%
- Cores
- 37,440
- Power
- -
- Per watt
- - GF/W
Figures are as last publicly reported for the configuration described below, not a live measurement. Where a system was upgraded in place, the post-upgrade configuration is shown and the earlier one appears in the timeline.
What this machine is made of
One row per supplier relationship. “Supplier at build” is the company that shipped the part at the time; where that company has since been acquired, the parent it rolls up to today is shown beside it. That distinction is what makes ticker-level aggregation possible across a thirty-year dataset.
| Role | Part | Supplier at build | Quantity | Confidence | Source |
|---|---|---|---|---|---|
| Integrator | - IBM POWER9-hosted GPU system | IBM | - | Reported | texascale.orgtop500.org |
| Accelerator | NVIDIA Tesla V100 Accelerators CUDA (Volta GV100) · 5,120C · 1.53 GHz · 12 nm · 300 W 448 NVIDIA V100 GPUs (SXM2) | NVIDIA | 448 reported | Reported | texascale.orgtop500.org |
| CPU | - IBM POWER9 20C 3.6GHz | IBM | - | Reported | top500.org |
| Interconnect | Mellanox InfiniBand EDR Interconnect Fat tree · 100 Gb/s per 4x port · About 0.9 microseconds InfiniBand EDR | NVIDIA | - | Reported | top500.org |
The read
IBM POWER9 GPU subsystem at the Texas Advanced Computing Center, announced alongside Frontera in 2019 with 448 NVIDIA V100 GPUs for machine learning, deep learning and molecular dynamics work. TOP500 lists 37,440 cores on InfiniBand EDR and 2.29 PFlop/s Rmax, debuting at rank 120 on the November 2019 list.
Timeline
- 2019 Announced source
- 2019 First operational source
- 2019-11 List debut at #120 (November 2019) source
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Site & facility
Texas Advanced Computing Center
- Location
- Austin, TX, USA
- Cooling
- Direct liquid cooling
- Commissioned
- 2007
Change history
- 2026-10-02 Added Longhorn, TACC's POWER9 and V100 subsystem
Source check
We fetched this system's own citations and recorded whether each page actually mentions it. This is a corroboration signal, not a fact check, and it is published so you can see how well the sourcing holds up rather than take it on trust.
| Cited source | Result | Found on the page |
|---|---|---|
| texascale.org | names system, part and count | Mellanox InfiniBand EDR · counts: 448 |
| top500.org | names system and part | NVIDIA Tesla V100, Mellanox InfiniBand EDR |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.
Further reading
Operating a supercomputer
Acceptance testing, why "installed" and "in production" are six months apart, and the machine lifecycle.
Inside a node
Latency-optimised versus throughput-optimised processors, NUMA, and the end of the host-to-device copy.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.