Supercomputers/Systems/ABCI-Q
Japan · operational · mixed
ABCI-Q
Quantum: linked to G-QuAT System F (64 superconducting qubits), G-QuAT System Q (260 neutral atom qubits)
Operated by AIST at ABCI Data Center, Kashiwa .
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
- 74.58 PFlop/s
- Rpeak
- 99.35 PFlop/s
- Rmax ÷ Rpeak
- 75.1%
- Cores
- 315,120
- Power
- 1.83 MW
- Per watt
- 40.7 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 SYS-221GE-TNHT-LCC, built by Fujitsu | Fujitsu | - | Reported | top500.orgnvidianews.nvidia.com |
| Accelerator | NVIDIA H100 SXM5 Accelerators CUDA (Hopper GH100) · 16,896C · 1.98 GHz · TSMC 4N · 700 W >2,000 NVIDIA H100 GPUs | NVIDIA | - | Verified | top500.orgnvidianews.nvidia.com |
| CPU | Intel Xeon Platinum 8558 CPUs x86-64 · 48C · 2.1 GHz · Intel 7 Xeon Platinum 8558 48C 2.1GHz | 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 Quantum-2 | NVIDIA | - | Verified | top500.orgnvidianews.nvidia.com |
The read
AIST and Fujitsu's hybrid quantum-classical research platform. The Rmax/Rpeak/core figures here describe only its classical GPU partition (NVIDIA H100, Xeon Platinum hosts), which is the only part TOP500 measures. NVIDIA's own announcement frames the platform as built for future integration with quantum hardware; we could not independently confirm which quantum processors, if any, are currently attached, so no quantum-specific claim is recorded here.
Timeline
- 2024-03 Announced source
- 2025-06 List debut at #64 (June 2025) source
- 2025-06 First operational source
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Site & facility
ABCI Data Center, Kashiwa
- Location
- Kashiwa, Japan
- Cooling
- Direct liquid cooling with hot-water loop
- PUE
- 1.1
- Commissioned
- 2018
Change history
- 2026-09-22 Gained a Green500 rank pointer (#64 on the 2025-06 list)
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 |
|---|---|---|
| nvidianews.nvidia.com | names system and part | NVIDIA H100 SXM5, NVIDIA InfiniBand NDR (Quantum-2) |
| top500.org | names system and part | NVIDIA H100 SXM5, Intel Xeon Platinum 8558, NVIDIA InfiniBand NDR (Quantum-2) |
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.
Operating a supercomputer
Acceptance testing, why "installed" and "in production" are six months apart, and the machine lifecycle.