United Kingdom · operational · hpc

Iridis 4

Also known as Iridis4

Operated by University of Southampton at University of Southampton (Iridis) .

Researched with AI assistance, checked by scripts. These rows were researched by AI agents reading public operator, laboratory and vendor sources, appended by scripts and checked by automated validation; no subject-matter expert has reviewed them (how this site is made). A mechanical second-reader pass has since fetched every cited source: 1350 of 1540 systems have a readable citation that names them, and 64 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: 227.03 TFlop/s
Rpeak: 249.60 TFlop/s
Rmax ÷ Rpeak: 91.0%
Cores: 12,000
Power: 249.26 kW
Per watt: 0.9 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	- IBM iDataPlex DX360M4 (IBM Intelligent Cluster)	IBM IBMNYSE	-	Reported	top500.org southampton.ac.uk
Integrator	- Designed, integrated and supported by OCF	OCF	-	Reported	southampton.ac.uk
Accelerator	- Intel Xeon Phi coprocessors	Intel INTCNASDAQ	-	Reported	southampton.ac.uk
CPU	Intel Xeon E5-2670 CPUs x86-64 · 8C · 2.6 GHz · 32 nm · 115 W Xeon E5-2670 8C 2.6GHz	Intel INTCNASDAQ	-	Reported	top500.org southampton.ac.uk
Interconnect	Mellanox InfiniBand FDR Interconnect Fat tree · 56 Gb/s per 4x port · About 1 microsecond Infiniband FDR	Mellanox NVDANASDAQ rolls up to NVIDIA	-	Reported	top500.org southampton.ac.uk

The read

University of Southampton's fourth-generation Iridis cluster, switched on in October 2013 in a GBP 3.2 million deal: IBM Intelligent Cluster hardware integrated by OCF, with 12,200 Xeon E5-2670 cores, 1 PB of disc, 50 TB of memory and Intel Xeon Phi coprocessors, billed as four times Iridis 3 and with around 350 projects expected in its first year. TOP500 lists an IBM iDataPlex DX360M4 with FDR InfiniBand, 12,000 cores, Rmax 227.03 TF, Rpeak 249.6 TF and 249.26 kW, ranked 180 in Nov 2013 and 452 in Nov 2015; the 12,000 versus 12,200 core counts differ between the two sources. Its successor line is iridis-5.

Timeline

2013-10 First operational source
2013-11 List debut at #180 (November 2013) source

Public list appearances

Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.

#180: TOP500, November 2013 →

Site & facility

University of Southampton (Iridis)

Location: Southampton, United Kingdom

southampton.ac.uk top500.org

Change history

2026-10-17 Iridis 4 added from its source pages

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
southampton.ac.uk	names system and part	Intel Xeon E5-2670, Mellanox InfiniBand FDR
top500.org	names system and part	Intel Xeon E5-2670, Mellanox InfiniBand FDR

Checked 2026-10-18 by pnpm verify. Re-run it and the table changes with the web.