USA · operational · mixed

Lonestar6

Also known as TACC Lonestar6; LS6

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: -
Rpeak: -
Rmax ÷ Rpeak: -
Cores: -
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	- Dell PowerEdge servers	Dell Technologies DELLNYSE	-	Reported	nextplatform.com
Accelerator	- NVIDIA A100 40 GB, three per GPU node across 84 GPU nodes	NVIDIA NVDANASDAQ	-	Reported	docs.tacc.utexas.edu
Accelerator	- Four NVIDIA H100 nodes with AMD EPYC 9454 hosts	NVIDIA NVDANASDAQ	-	Reported	docs.tacc.utexas.edu
CPU	AMD EPYC 7763 (Milan) CPUs x86-64 · 64C · 2.45 GHz · 7 nm · 280 W Two AMD EPYC 7763 64-core 'Milan' per compute node, 560 compute nodes	AMD AMDNASDAQ	-	Verified	docs.tacc.utexas.edu nextplatform.com
Interconnect	NVIDIA InfiniBand HDR Interconnect Fat tree or dragonfly+ · 200 Gb/s per port · About 0.6 microseconds Mellanox HDR 200 Gb/s fat tree, sixteen core switches	NVIDIA NVDANASDAQ	-	Verified	docs.tacc.utexas.edu nextplatform.com

The read

TACC's system for Texas researchers, the sixth in the Lonestar series. TACC's user guide (updated September 2026) lists 560 CPU nodes with two AMD EPYC 7763 64-core processors and 256 GB of DDR4, 84 A100 GPU nodes with two EPYC 7763 and three NVIDIA A100 40 GB each, 4 H100 nodes with two EPYC 9454, a full-HDR (200 Gb/s) Mellanox fat-tree and an 8 PB BeeGFS scratch file system. The Next Platform's November 2021 report on the launch gives the Dell servers, EPYC 7763 and HDR fabric, 16 GPU nodes with two A100 each at that time, mixed dielectric-bath and air cooling, and $8.4 million of funding from UT Austin, University of North Texas, Texas A&M and Texas Tech, so the GPU partition has since been expanded. No HPL result or total core count is published in the pages fetched, so FLOPS and cores are blank.

Timeline

2021-11 Announced source

Site & facility

Texas Advanced Computing Center

Location: Austin, TX, USA
Cooling: Direct liquid cooling
Commissioned: 2007

tacc.utexas.edu

Change history

2026-10-04 Added Lonestar6 (tacc)

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
docs.tacc.utexas.edu	names system and part	AMD EPYC 7763 (Milan), NVIDIA InfiniBand HDR
nextplatform.com	names system and part	AMD EPYC 7763 (Milan), NVIDIA InfiniBand HDR

Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.