Supercomputers/Systems/MN-2
Japan · operational · ai training
MN-2
Also known as PFN MN-2 GPU cluster
Operated by Preferred Networks at Preferred Networks (Yokohama) .
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
- -
- Rpeak
- -
- Rmax ÷ Rpeak
- -
- Cores
- 5,760
- 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 |
|---|---|---|---|---|---|
| Integrator | - Built and managed solely by Preferred Networks | Preferred Networks | - | Reported | projects.preferred.jppreferred.jp |
| Accelerator | NVIDIA Tesla V100 Accelerators CUDA (Volta GV100) · 5,120C · 1.53 GHz · 12 nm · 300 W 128 GPU servers with eight V100 SXM each | NVIDIA | 1,024 reported | Reported | preferred.jpprojects.preferred.jp |
The read
Preferred Networks' first GPU cluster built and managed solely by PFN, announced 18 March 2019 and operating from July 2019 on the premises of JAMSTEC's Yokohama Institute for Earth Sciences: 1,024 NVIDIA V100 GPUs in 128 GPU servers (8 each), 5,760 CPU cores, about 128 PFLOPS mixed-precision peak, four 100 GbE links per node using RoCEv2, and over 10 PB of software-defined storage. More than double the peak of its predecessor MN-1b. Succeeded by the MN-Core based MN-3.
Site & facility
Preferred Networks (Yokohama)
- Location
- Yokohama, Japan
- Commissioned
- 2020
Change history
- 2026-10-02 Added MN-2, Preferred Networks' 1,024-GPU V100 cluster in Yokohama
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 |
|---|---|---|
| projects.preferred.jp | names system only | - |
| preferred.jp | names system only | · counts: 1024 |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.