South Korea · operational · hpc

Aleph

Also known as IBS Center for Climate Physics supercomputer

Operated by Institute for Basic Science at IBS Headquarters Daejeon .

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: 971.00 TFlop/s
Rpeak: 1.44 PFlop/s
Rmax ÷ Rpeak: 67.4%
Cores: 18,720
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	- Cray XC50, 468 compute nodes	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Verified	top500.org ibsclimate.org
CPU	Intel Xeon Gold 6148 CPUs x86-64 · 20C · 2.4 GHz · 14 nm · 150 W Intel Xeon Gold 6148 20C 2.4GHz Skylake, two per node	Intel INTCNASDAQ	-	Reported	top500.org ibsclimate.org
Interconnect	Cray Aries Interconnect Dragonfly · About 10 GB/s per direction · Around 1 microsecond Cray Aries interconnect	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Reported	top500.org
Storage	- Cray ClusterStor L300F, 8.52 PiB Lustre file system	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Verified	ibsclimate.org top500.org

The read

The Institute for Basic Science supercomputer for its Center for Climate Physics (ICCP) at Pusan National University, housed at IBS headquarters in Daejeon: a Cray XC50 of 468 Skylake nodes (40 cores and 192 GB each, Xeon Gold 6148) on Cray Aries, with liquid cooling, an 8.52 PiB Lustre file system on Cray ClusterStor L300F and a 43 PB tape archive. TOP500 lists 18,720 cores, 0.97 PFlop/s Rmax and 1.44 PFlop/s Rpeak, 445th on the November 2018 list. ICCP's facility page independently gives the XC50, 18,720 cores and a 1.43 PFlop/s peak, and Cray's September 2018 announcement (via TOP500) gives the roughly $9 million contract. No retirement notice was found; TOP500 is the only source for Rmax.

Timeline

2018 First operational source
2018-09 Announced source
2018-11 List debut at #445 (November 2018) source

Public list appearances

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

#445: TOP500, November 2018 →

Site & facility

IBS Headquarters Daejeon

Location: Daejeon, South Korea
Commissioned: 2018

ibsclimate.org ibsclimate.org

Change history

2026-10-02 Added Aleph, the IBS Center for Climate Physics Cray XC50

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
ibsclimate.org	names system only	-
top500.org	names system and part	Intel Xeon Gold 6148, Cray Aries

Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.