Supercomputers/Systems/CMCC Cassandra
Italy · operational · hpc
CMCC Cassandra
Also known as Cassandra
Operated by CMCC at CMCC Supercomputing Center (Lecce) .
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
- 1.23 PFlop/s
- Rmax ÷ Rpeak
- -
- Cores
- 20,160
- 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 | - Lenovo ThinkSystem SD650 V3 nodes (180) | Lenovo | 180 reported | Reported | cmcc.itnews.lenovo.com |
| CPU | - Two Intel Xeon Max 9480 (Sapphire Rapids, HBM) per node, 20,160 cores in total | Intel | - | Reported | cmcc.itnews.lenovo.com |
| Interconnect | NVIDIA InfiniBand NDR (Quantum-2) Interconnect Fat tree or dragonfly+ · 400 Gb/s per port · Under 0.6 microseconds InfiniBand NDR 400 Gbps | NVIDIA | - | Reported | cmcc.it |
| Cooling | - Lenovo Neptune direct water cooling | Lenovo | - | Reported | news.lenovo.comcmcc.it |
The read
CMCC's newer climate HPC system in Lecce: 180 Lenovo ThinkSystem SD650 V3 direct-water-cooled nodes (Lenovo Neptune) each with two Intel Xeon Max 9480 (Sapphire Rapids with HBM, 56 cores) CPUs, 20,160 cores, 1 TB per node, InfiniBand NDR 400 Gbps, 1,225 TFlop/s peak and 13.6 PB of storage on Red Hat 9. Lenovo announced the order on 9 May 2024 as a 1.2 PFlop/s system that doubles the centre's earlier capacity, with two extra nodes of eight NVIDIA H100 GPUs each planned for AI work and installation by partner Ricca IT scheduled for 2024. The exact go-live date is not stated in the sources, so the first-operational year is recorded as 2024 and the status date is the 2026-10 listing. No TOP500 entry was found.
Site & facility
Change history
- 2026-10-02 Added CMCC Cassandra
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 |
|---|---|---|
| news.lenovo.com | names system only | - |
| cmcc.it | names system and part | NVIDIA InfiniBand NDR (Quantum-2) |
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.