Supercomputers/Systems/RE1A (Flatiron)
USA · operational · hpc
RE1A (Flatiron)
Also known as Flatiron RE1A
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 1581 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
- 1.77 PFlop/s
- Rpeak
- 3.01 PFlop/s
- Rmax ÷ Rpeak
- 58.8%
- Cores
- 17,856
- Power
- 116.81 kW
- Per watt
- 15.2 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.
How it compares
Ranked against the other machines in this dataset that report the same figure: those that first came into service within two years of RE1A (Flatiron), and those in USA. Computed from our tables; a metric is ranked only when at least eight peers report it.
| Metric | Value | Against its era | Against its country |
|---|---|---|---|
| Rmax | 1.77 PFlop/s | #242 of 246 · bottom 3% | #153 of 332 · top 46% |
| Energy efficiency | 15.2 GF/W | #73 of 130 · bottom 45% | #30 of 162 · top 18% |
| Rmax ÷ Rpeak | 58.8 % | #211 of 243 · bottom 14% | #285 of 331 · bottom 15% |
| Power draw | 117 kW | #114 of 133 · bottom 15% | #145 of 171 · bottom 16% |
Every metric is ranked largest-first, so a high power-draw rank means a big power draw, not a good one. Rmax ÷ Rpeak uses HPL-measured results only. Rankings move as machines are added; they describe this dataset, not the world.
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 40GB Accelerators CUDA (Ampere GA100) · 6,912C · 1.41 GHz · 7 nm · 400 W NVIDIA A100 40GB | NVIDIA | - | Reported | top500.org |
| CPU | Intel Xeon Platinum 8362 (Ice Lake) CPUs x86-64 · 32C · 2.8 GHz · Intel 10nm SuperFin Intel Xeon Platinum 8362 32C 2.8GHz | 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
Sibling of RE1 (flatiron-re1) at the Flatiron Institute: Lenovo ThinkSystem SD650-N V2 with Xeon Platinum 8362 32-core 2.8 GHz, NVIDIA A100 40GB and InfiniBand HDR, installed 2022. TOP500 lists 17,856 cores, the same as RE1, with Rmax 1.77 and Rpeak 3.01 PFlop/s at 116.81 kW (power measurement level 1); it appeared only once, at 488th in November 2022, and it needed a higher power draw than RE1 for a lower result. The A100 40GB and 8362 differences from RE1 are the only hardware distinction TOP500 shows, and no Flatiron page describing RE1A was found, so TOP500 is the sole source, the tier is reported and the status date is the single list it appeared on.
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 RE1A (Flatiron)
Nearby in scale
The machines closest to RE1A (Flatiron) by Rmax, smaller to larger.
- G42 POD3 · United Arab Emirates, operational · 1.76 PFlop/s
- Jaguar · USA, upgraded · 1.76 PFlop/s
- CARA · Germany, operational · 1.75 PFlop/s
- Fermi · Italy, decommissioned · 1.79 PFlop/s
- IMS Molecular Simulator · Japan, operational · 1.79 PFlop/s
- State Grid ESSystem · China, operational · 1.79 PFlop/s
Related systems
Same operator
- Henri · USA, operational, 2022
- RE1 (Flatiron) · USA, operational, 2022
- Alpha (Flatiron) · USA, operational, 2024
- Raphael · USA, operational
Same accelerator
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.