Supercomputers/Systems/RE1 (Flatiron)
USA · operational · hpc
RE1 (Flatiron)
Also known as Flatiron RE1
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
- 1.93 PFlop/s
- Rpeak
- 3.00 PFlop/s
- Rmax ÷ Rpeak
- 64.3%
- Cores
- 17,856
- Power
- 99.11 kW
- Per watt
- 19.5 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 SD650-N V2 | Lenovo | - | Reported | top500.org |
| Accelerator | NVIDIA A100 SXM4 80GB Accelerators NVIDIA A100 80GB | 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 Infiniband HDR | NVIDIA | - | Reported | top500.org |
The read
GPU cluster of the Flatiron Institute, the Simons Foundation's computational research division, listed by TOP500 as RE1: Lenovo ThinkSystem SD650-N V2 with Xeon Platinum 8358 32-core 2.6 GHz, NVIDIA A100 80GB and InfiniBand HDR under Linux, installed 2022. It has 17,856 cores, Rmax 1.93 and Rpeak 3.00 PFlop/s at 99.11 kW (power measurement level 1), ranked 442nd in November 2022 and 486th in June 2023, its last list. Its sibling RE1A (flatiron-re1a) was submitted on the same list with A100 40GB and the same 17,856 cores, and the Institute's other TOP500 systems are Henri (henri), Raphael (flatiron-raphael) and Alpha (flatiron-alpha). TOP500 is the only source: no Flatiron page naming RE1 was found, so the tier is reported, and no site or in-service date is published.
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 RE1 (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.