Supercomputers/Systems/SAKURAONE CYC
Japan · operational · mixed
SAKURAONE CYC
Operated by SAKURA internet at SAKURA internet (Ishikari) .
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
- 19.31 PFlop/s
- Rpeak
- 29.90 PFlop/s
- Rmax ÷ Rpeak
- 64.6%
- Cores
- 64,680
- 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 | - Supermicro SuperServer H200 | Supermicro | - | Reported | top500.orgsakura.ad.jp |
| Accelerator | NVIDIA H200 SXM Accelerators CUDA (Hopper GH100) · 16,896C · 1.98 GHz · TSMC 4N · 700 W 55 H200 nodes with eight NVIDIA H200 SXM 141GB GPUs each (service page; TOP500 entry not named) | NVIDIA | 440 estimated | Reported | sakura.ad.jptop500.org |
| CPU | - Two Intel Xeon Platinum 8580 (60 cores) per node across 55 nodes | Intel | 110 estimated | Reported | sakura.ad.jptop500.org |
| Operating system | Rocky Linux Operating systems RHEL-compatible Linux, community-maintained · Downstream rebuild of Red Hat Enterprise Linux source Rocky Linux 9.6 | Rocky Enterprise Software Foundation | - | Reported | top500.org |
The read
The H200-based entry in SAKURA internet's SAKURAONE family; the original H100 machine is the sakuraone row, which already notes that CYB, CYC and CYD were entered separately. TOP500 lists SAKURAONE CYC as a Supermicro SuperServer H200 with Xeon Platinum 8580 60C 2 GHz and NVIDIA H200 SXM5 141 GB under 'SAKURA Internet Inc. / Prunus Solutions Inc.', installed 2025, with 64,680 cores, Rmax 19.31 and Rpeak 29.90 PFlop/s, HPCG 307.854 TFlop/s and Rocky Linux 9.6; it ranked 93rd in November 2025 and 113th in June 2026. SAKURA's managed-HPC service page offers an H200 partition of 55 nodes with eight H200 GPUs (440 GPUs) and two Xeon Platinum 8580 per node (6,600 cores) on 400GbE x 8, which fits the TOP500 CPU and GPU models, but the page does not name the TOP500 entry, so the 440-GPU quantity is our inference. TOP500 lists the interconnect only as Ethernet. The B200 sibling is sakuraone-cyb; CYD (37.79 PFlop/s, June 2026) is not recorded.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Site & facility
Change history
- 2026-10-17 Added SAKURAONE CYC
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 |
|---|---|---|
| sakura.ad.jp | names system, part and count | NVIDIA H200 SXM · counts: 440 |
| top500.org | names system and part | NVIDIA H200 SXM, Rocky Linux |
Checked 2026-10-18 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
Why accelerators exist, what the memory hierarchy costs, and how the CPU and accelerator merged onto one package.
Programming a supercomputer
The software stack beneath the application, and why the OS is now a sovereignty signal as much as a technical choice.