Supercomputers/Systems/Alpha (Flatiron)
USA · operational · hpc
Alpha (Flatiron)
Also known as Flatiron Alpha
Operated by Flatiron Institute .
Researched with AI assistance, checked by scripts. These rows were researched by AI agents reading public operator, laboratory and vendor sources, appended by scripts and checked by automated validation; no subject-matter expert has reviewed them (how this site is made). A mechanical second-reader pass has since fetched every cited source: 1350 of 1540 systems have a readable citation that names them, and 64 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
- 4.10 PFlop/s
- Rpeak
- 4.99 PFlop/s
- Rmax ÷ Rpeak
- 82.2%
- Cores
- 7,488
- 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 | - Lenovo ThinkSystem SR680a V3 | Lenovo | - | Reported | top500.org |
| Accelerator | - NVIDIA H100 | NVIDIA | - | Reported | top500.org |
| CPU | - Intel Xeon Platinum 9242 48C 2.3GHz as published by TOP500 | Intel | - | Reported | top500.org |
| Interconnect | NVIDIA InfiniBand NDR (Quantum-2) Interconnect Fat tree or dragonfly+ · 400 Gb/s per port · Under 0.6 microseconds Infiniband NDR | NVIDIA | - | Reported | top500.org |
The read
H100 GPU system of the Flatiron Institute - Simons Foundation, listed by TOP500 as Alpha: Lenovo ThinkSystem SR680a V3, NVIDIA H100 and InfiniBand NDR under Linux, installed 2024. It has 7,488 cores, Rmax 4.10 and Rpeak 4.99 PFlop/s (82 percent efficiency) with no power or HPCG figure, debuted at 243rd in November 2024 and was 344th in June 2026, its most recent list. TOP500's processor field reads Intel Xeon Platinum 9242 48C 2.3GHz, and the CPU edge is recorded exactly as published because no other source describes the machine. It is a newer sibling of Raphael (flatiron-raphael, also 2024 and H100) and of the 2022 RE1 pair; no Flatiron page naming Alpha was found, so TOP500 is the only source and the tier is reported.
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
- 2026-10-18 Added Alpha (Flatiron)
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.