Supercomputers/Systems/Hunter
Germany · operational · hpc
Hunter
Operated by HLRS at HLRS, University of Stuttgart .
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
- 31.68 PFlop/s
- Rpeak
- 45.14 PFlop/s
- Rmax ÷ Rpeak
- 70.2%
- Cores
- 181,440
- Power
- 490 kW
- Per watt
- 64.7 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 | - HPE Cray EX4000 | Hewlett Packard Enterprise | - | Reported | hlrs.detop500.org |
| Accelerator | AMD Instinct MI300A Accelerators ROCm (CDNA 3) · TSMC N5/N6 · 550 W 752 AMD Instinct MI300A APUs | AMD | 752 reported | Reported | hlrs.detop500.org |
| CPU | AMD 4th Gen EPYC 24C (in MI300A) CPUs x86-64 · 24C · 1.8 GHz · TSMC N5 AMD 4th Gen EPYC 24C 1.8GHz | AMD | - | Reported | top500.org |
| Interconnect | HPE Slingshot-11 Interconnect Dragonfly · 200 Gb/s per port · Around 2 microseconds Slingshot-11 | Hewlett Packard Enterprise | - | Reported | top500.orghlrs.de |
| Storage | HPE Cray ClusterStor E2000 Storage Cray ClusterStor E2000, 25 PB | Hewlett Packard Enterprise | - | Reported | hlrs.de |
| Cooling | Direct liquid cooling, warm water Cooling Direct-to-chip cold plates, facility water loop · Removes 90+ percent of node heat to liquid 100% fanless direct liquid cooling | Hewlett Packard Enterprise | - | Reported | hlrs.de |
| Operating system | Red Hat Enterprise Linux Operating systems Linux distribution · Open source, commercial support subscription RHEL 9 | Red Hat | - | Reported | top500.org |
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 |
|---|---|---|---|---|---|
| IT power | 0.56 MW | 2026-10 | Operator stated | HLRS technical details: energy usage (average) 560 kW for the system. | hlrs.de |
The read
HLRS's HPE Cray EX with 752 AMD Instinct MI300A APUs, inaugurated in January 2025; first ranked 54th on the June 2025 TOP500, then 61st and 76th as newer systems overtook it. HLRS confirms the hardware, fanless direct liquid cooling and a 48.1 PFlop/s theoretical peak, which differs from TOP500's 45.14 because they are different measures. HLRS's own post says rank 53 in June 2025 against TOP500's 54; TOP500's is used. Rmax and power rest on TOP500 alone.
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
HLRS, University of Stuttgart
- Location
- Stuttgart, Germany
- Cooling
- Direct liquid cooling
- Commissioned
- 1996
Where sources disagree
We record conflicts instead of picking a winner quietly. All open questions.
- Rank in June 2025: 53rd (HLRS post) against 54th (TOP500). TOP500's figure is used.
Change history
- 2026-09-22 Gained a Green500 rank pointer (#12 on the 2025-06 list)
- 2026-09-20 Added with a rank pointer on the edition where it ranked highest
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 |
|---|---|---|
| hlrs.de | names system, part and count | AMD Instinct MI300A, HPE Cray ClusterStor E2000 · counts: 752 |
| top500.org | names system and part | AMD Instinct MI300A, HPE Slingshot-11, HPE Cray ClusterStor E2000 |
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
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.