Supercomputers/Systems/Maru
South Korea · operational · hpc
Maru
Also known as KMA Supercomputer No. 5 (Maru)
Operated by Korea Meteorological Administration .
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
- 18.00 PFlop/s
- Rpeak
- 25.50 PFlop/s
- Rmax ÷ Rpeak
- 70.6%
- Cores
- 306,432
- Power
- 3.30 MW
- Per watt
- 5.5 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 | - Lenovo ThinkSystem SD650 V2 | Lenovo | - | Reported | top500.orgnextplatform.com |
| CPU | - Intel Xeon Platinum 8368Q 38C 2.6GHz | Intel | - | 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.orgnextplatform.com |
| Cooling | Direct liquid cooling, warm water Cooling Direct-to-chip cold plates, facility water loop · Removes 90+ percent of node heat to liquid Lenovo Neptune direct-water cooling | Lenovo | - | Reported | nextplatform.com |
The read
The twin of Guru: the second Lenovo ThinkSystem SD650 V2 weather supercomputer of the Korea Meteorological Administration, installed in 2021 so operational forecasts can fail over between the two. TOP500 lists identical figures to Guru, Intel Xeon Platinum 8368Q 38C 2.6GHz over InfiniBand HDR, Rmax 18.00 PFlop/s, Rpeak 25.50 PFlop/s, 306,432 cores and 3,296 kW; its fetched history runs from November 2021 (rank 28) to June 2026 (rank 121). The Next Platform reports the pair at 25 petaflops peak each with Lenovo Neptune direct-water cooling. The CPU model rests on TOP500 alone, so the tier is reported, and the site is left unlocated.
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
- 2026-10-02 Added Maru
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 InfiniBand HDR |
| nextplatform.com | names system and part | NVIDIA InfiniBand HDR, Direct liquid cooling, warm water |
Checked 2026-10-09 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
Latency-optimised versus throughput-optimised processors, NUMA, and the end of the host-to-device copy.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.