Japan · operational · mixed

ROQUO

Also known as JHPC-quantum GPU supercomputer

Operated by RIKEN at RIKEN Center for Computational Science .

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: 19.80 PFlop/s
Rpeak: -
Rmax ÷ Rpeak: -
Cores: -
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	- DTS Corporation built the system as primary builder	DTS Corporation	-	Reported	riken.jp r-ccs.riken.jp
Accelerator	- NVIDIA GB200 NVL4 Blackwell GPUs, 540 across 135 compute nodes	NVIDIA NVDANASDAQ	540 verified	Verified	riken.jp investor.nvidia.com
CPU	NVIDIA Grace CPUs Armv9 (Neoverse V2) · 72C · 3.1 GHz · TSMC 4N NVIDIA Grace CPUs, 270 in total	NVIDIA NVDANASDAQ	270 reported	Reported	riken.jp
Interconnect	NVIDIA InfiniBand XDR (Quantum-X800) Interconnect Fat tree or dragonfly+ · 800 Gb/s per port NVIDIA Quantum-X800 InfiniBand up to 3.2 Tb/s	NVIDIA NVDANASDAQ	-	Verified	riken.jp investor.nvidia.com
Storage	- DataDirect Networks high-speed file system	DDN	-	Reported	riken.jp
Cooling	- warm-water free cooling with 32 C coolant	RIKEN	-	Reported	riken.jp

AI datacenter metrics

Figures beyond an accelerator count, each with who stated it. What can and cannot be compared across AI datacenters.

Metric	Value	As of	Basis	Note	Source
Accelerators	540 accelerators	2026-10	Operator stated	135 GB200 NVL4 nodes; RIKEN and NVIDIA agree on 540 Blackwell GPUs.	riken.jp investor.nvidia.com

The read

RIKEN's GPU supercomputer for quantum-HPC hybrid research under the NEDO JHPC-quantum project, at the Kobe campus: 135 nodes of NVIDIA GB200 NVL4 with 540 Blackwell GPUs and 270 Grace CPUs on Quantum-X800 InfiniBand, 19.80 PFLOPS measured in HPL and warm-water free cooling with 32 C coolant. RIKEN names DTS Corporation as primary builder, Giga Computing Technology for node design and manufacture, ScaleWorX for integration and DataDirect Networks for the file system. Operation began on 19 June 2026. NVIDIA's November 2025 release independently gives the 540-GPU count. It has no TOP500 entry recorded here.

Timeline

2025-11-17 Announced source
2026-06-19 First operational source

Site & facility

RIKEN Center for Computational Science

Location: Kobe, Japan
Cooling: Direct liquid cooling (warm water)
Commissioned: 2010

r-ccs.riken.jp

Change history

2026-10-07 Added ROQUO (RIKEN)

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
investor.nvidia.com	could not be fetched	-
riken.jp	names system, part and count	NVIDIA Grace, NVIDIA InfiniBand XDR (Quantum-X800) · counts: 270

Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.