Supercomputers/Systems/Sejong
South Korea · operational · ai training
Sejong
Operated by Naver .
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
- 32.97 PFlop/s
- Rpeak
- 40.77 PFlop/s
- Rmax ÷ Rpeak
- 80.9%
- Cores
- 277,760
- 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 |
|---|---|---|---|---|---|
| Accelerator | NVIDIA A100 (in DGX A100) Accelerators NVIDIA DGX A100 with NVIDIA A100 accelerators | NVIDIA | - | Reported | top500.org |
| CPU | AMD EPYC 7742 (Rome) CPUs x86-64 · 64C · 2.25 GHz · 7 nm · 225 W AMD EPYC 7742 64C 2.25GHz | AMD | - | 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 |
| Operating system | Ubuntu Server Operating systems Linux distribution · Open source, free with paid support tiers Ubuntu 20.04.2 LTS | Canonical | - | Reported | top500.org |
The read
NAVER Corp's TOP500 entry: an NVIDIA DGX A100 system with AMD EPYC 7742 64C 2.25GHz hosts, NVIDIA A100 accelerators and Infiniband HDR, running Ubuntu 20.04.2 LTS, with 277,760 cores and an Rmax of 32.97 PFlop/s (Rpeak 40.77). It debuted at rank 22 on the November 2023 list and had slipped to rank 72 by June 2026 as newer systems arrived. TOP500 does not state a workload; AI training is inferred from the DGX A100 architecture and NVIDIA's October 2020 statement that Naver Clova uses a 140-node DGX A100 SuperPOD for language-model research (the relationship between that earlier SuperPOD and this listing is not stated by either source). Data-center site is not given on the TOP500 page, so it is left unlocated. Only TOP500 was independently fetched for this system, so confidence stays 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
- 2026-10-01 Added Sejong (Naver)
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 | NVIDIA A100 (in DGX A100), AMD EPYC 7742 (Rome), NVIDIA InfiniBand HDR, Ubuntu Server |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.
Further reading
Inside a node
Why accelerators exist, what the memory hierarchy costs, and how the CPU and accelerator merged onto one package.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.
Programming a supercomputer
The software stack beneath the application, and why the OS is now a sovereignty signal as much as a technical choice.