Supercomputers/Systems/ARCHER2
United Kingdom · operational · hpc
ARCHER2
Operated by EPCC at Advanced Computing Facility, Edinburgh .
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: 32 of 52 systems have a readable citation that names them, and 4 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
- 19.54 PFlop/s
- Rpeak
- 25.80 PFlop/s
- Rmax ÷ Rpeak
- 75.7%
- Cores
- 748,544
- 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 | - HPE Cray EX235a | Hewlett Packard Enterprise | - | Reported | archer2.ac.ukhpe.com |
| CPU | AMD EPYC 7742 (Rome) CPUs AMD EPYC 7742 64C 2.25GHz | AMD | - | Reported | archer2.ac.ukhpe.com |
| Interconnect | HPE Slingshot-10 Interconnect Slingshot-10 | Hewlett Packard Enterprise | - | Reported | archer2.ac.ukhpe.com |
| Storage | HPE Cray ClusterStor E1000 Storage Lustre on ClusterStor | Hewlett Packard Enterprise | - | Reported | archer2.ac.ukhpe.com |
| Cooling | Direct liquid cooling, warm water Cooling HPE Cray EX cabinet: 100% direct liquid cooled | Hewlett Packard Enterprise | - | Reported | archer2.ac.ukhpe.com |
| Operating system | HPE Cray Operating System Operating systems HPE Cray Operating System | Hewlett Packard Enterprise | - | Reported | archer2.ac.ukhpe.com |
The read
The UK national service, and another CPU-only EPYC machine on HPE Cray hardware. Between ARCHER2, Hawk and Fugaku, the dataset holds three large systems from three continents that all declined accelerators in the same window.
Timeline
- 2019 Announced source
- 2021-11 List debut at #22 (November 2021) source
- 2021-11 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
Advanced Computing Facility, Edinburgh
- Location
- Edinburgh, United Kingdom
- Cooling
- Direct liquid cooling
- Commissioned
- 1990
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 |
|---|---|---|
| archer2.ac.uk | names system and part | HPE Cray Operating System, HPE Cray ClusterStor E1000 |
| hpe.com | does not name this system | Direct liquid cooling, warm water, HPE Cray Operating System, HPE Cray ClusterStor E1000 |
Checked 2026-09-08 by pnpm verify. Re-run it and the table changes with the web.
Further reading
Power and cooling
Why air ran out at 20 kW a rack, how warm-water cooling removes the chillers, and what PUE conceals.
Inside a node
Latency-optimised versus throughput-optimised processors, NUMA, and the end of the host-to-device copy.
Operating a supercomputer
Acceptance testing, why "installed" and "in production" are six months apart, and the machine lifecycle.