Supercomputers/Systems/THX.A.B
France · operational · hpc
THX.A.B
Also known as Atos THX.A.B
Operated by Atos .
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
- 3.50 PFlop/s
- Rpeak
- 4.98 PFlop/s
- Rmax ÷ Rpeak
- 70.3%
- Cores
- 25,056
- Power
- 86.06 kW
- Per watt
- 40.7 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 | - BullSequana XH2000 | Bull | - | Reported | top500.orgtop500.org |
| Accelerator | NVIDIA A100 SXM4 64GB Accelerators CUDA (Ampere GA100) · 6,912C · 1.41 GHz · 7 nm · 400 W NVIDIA A100 SXM4 64GB | NVIDIA | - | Reported | top500.org |
| CPU | Intel Xeon Platinum 8358 CPUs x86-64 · 32C · 2.6 GHz · 10 nm · 250 W Intel Xeon Platinum 8358 32C 2.6GHz | Intel | - | Reported | top500.org |
| Interconnect | NVIDIA InfiniBand HDR Interconnect Fat tree or dragonfly+ · 200 Gb/s per port · About 0.6 microseconds Quad-rail NVIDIA HDR100 Infiniband | NVIDIA | - | Reported | top500.org |
The read
Atos BullSequana XH2000 system with Intel Xeon Platinum 8358 32C 2.6GHz processors, NVIDIA A100 SXM4 64GB GPUs and quad-rail NVIDIA HDR100 Infiniband (25,056 cores). It ranked fifth on the June 2022 Green500 at 41.411 GFlops/Watt, which TOP500 attributes to a power-optimized run of 84.64 kW; the standard run was 3.50 PFlop/s on 86.06 kW (TOP500 rank 146). Still listed in November 2025.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Change history
- 2026-10-07 Added THX.A.B
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 |
|---|---|---|
| top500.org | names system and part | Intel Xeon Platinum 8358, NVIDIA A100 SXM4 64GB, NVIDIA InfiniBand HDR |
| top500.org | names system and part | Intel Xeon Platinum 8358, NVIDIA A100 SXM4 64GB, NVIDIA InfiniBand HDR |
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.