Supercomputers/Systems/Unizah-II
Saudi Arabia · operational · hpc
Unizah-II
Operated by Saudi Aramco .
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
- 3.49 PFlop/s
- Rpeak
- 6.84 PFlop/s
- Rmax ÷ Rpeak
- 51.0%
- Cores
- 85,560
- 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 CS500 | Hewlett Packard Enterprise | - | Reported | top500.org |
| CPU | - Xeon Gold 6248 20C 2.5GHz | Intel | - | Reported | top500.org |
| Operating system | Red Hat Enterprise Linux Operating systems Linux distribution · Open source, commercial support subscription RHEL 7.7 | Red Hat | - | Reported | top500.org |
The read
A Saudi Aramco HPE Cray CS500 CPU cluster of Intel Xeon Gold 6248 20C 2.5GHz processors with a 10G Ethernet interconnect, running RHEL 7.7, installed in 2020. TOP500 lists Rmax 3.49 PFlop/s, Rpeak 6.84 PFlop/s and 85,560 cores; its fetched history runs from rank 86 on the November 2020 list to 386th in June 2026, which is the basis for the operational status. Aramco also lists larger systems Dammam-7, Ghawar-1 and Tuwaiq-1 and the smaller Unaizah-4, Makman-3 and Makman-2. The site within Saudi Arabia is not stated in a fetched page and no operator source was fetched, so the system is unlocated and the tier is reported.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Change history
- 2026-10-02 Added Unizah-II
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 |
|---|---|---|
| top500.org | names system only | - |
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.
Programming a supercomputer
The software stack beneath the application, and why the OS is now a sovereignty signal as much as a technical choice.