Supercomputers/Systems/Iridis 6
United Kingdom · operational · hpc
Iridis 6
Operated by University of Southampton at University of Southampton (Iridis) .
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
- 26,496
- 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 ProLiant Gen11 servers, 138 nodes | Hewlett Packard Enterprise | - | Reported | sdxcentral.com |
| CPU | AMD EPYC 9004 (Genoa) CPUs x86-64 · 96C · 2.4 GHz · TSMC N5 · 360 W 4th Gen AMD EPYC, 26,496 cores across 138 nodes | AMD | - | Reported | sdxcentral.comsouthampton.ac.uk |
| Interconnect | NVIDIA InfiniBand HDR Interconnect Fat tree or dragonfly+ · 200 Gb/s per port · About 0.6 microseconds InfiniBand HDR100 | NVIDIA | - | Reported | southampton.ac.uk |
The read
Southampton's successor to Iridis 5, unveiled in August 2024 as an HPE ProLiant Gen11 system with 138 nodes and 26,496 cores of 4th-generation AMD EPYC, described by HPE as about 1 PFLOPS HPL (subject to change as nodes are added) and four times the performance of Iridis 5 at 70 percent of the power. Southampton's facility page lists 26,000+ AMD cores for batch work, four 3 TB high-memory nodes and HDR100 InfiniBand. No measured Rmax is recorded here because the figure is stated as approximate.
Timeline
- 2024-08 Announced source
Site & facility
Change history
- 2026-10-02 Added Iridis 6, Southampton's HPE AMD EPYC cluster
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 |
|---|---|---|
| sdxcentral.com | names system and part | AMD EPYC 9004 (Genoa) |
| southampton.ac.uk | names system and part | NVIDIA InfiniBand HDR |
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.