Supercomputers/Systems/Terabit HPC Bubble
Italy · operational · mixed
Terabit HPC Bubble
Also known as INFN CNAF HPC Bubble
Operated by INFN at INFN CNAF Data Centre (Bologna) .
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
- 2.91 PFlop/s
- Rpeak
- 5.36 PFlop/s
- Rmax ÷ Rpeak
- 54.3%
- Cores
- 14,400
- 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 SR675 V3 | Lenovo | - | Reported | top500.org |
| Accelerator | - NVIDIA H100 80GB HBM3, 84 GPUs per INFN | NVIDIA | 84 reported | Verified | top500.orginfn.it |
| CPU | AMD EPYC 9004 (Genoa) CPUs x86-64 · 96C · 2.4 GHz · TSMC N5 · 360 W AMD EPYC 9654 96C 2.4GHz | AMD | - | Reported | top500.org |
| Interconnect | NVIDIA InfiniBand NDR (Quantum-2) Interconnect Fat tree or dragonfly+ · 400 Gb/s per port · Under 0.6 microseconds NVIDIA Infiniband NDR | NVIDIA | - | Reported | top500.org |
The read
The largest of the HPC bubbles built by Italy's National Institute for Nuclear Physics (INFN) under the TeRABIT project, installed at INFN-CNAF in Bologna and funded through the PNRR projects TERABIT, DARE and ICSC. INFN states the system has 7,104 CPU cores and 84 NVIDIA H100 GPUs and entered the TOP500 at 437th in November 2025, announcing it on 2 January 2026. TOP500 lists a Lenovo ThinkSystem SR675 V3 with AMD EPYC 9654 96-core 2.4 GHz CPUs, NVIDIA H100 80 GB HBM3 and NVIDIA InfiniBand NDR under AlmaLinux 9: 14,400 cores, Rmax 2.91 PFlop/s, Rpeak 5.36 PFlop/s, installed in 2025. INFN's 7,104 CPU cores differ from the TOP500 core count; the TOP500 figure is recorded. It ranked 462nd on June 2026.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Site & facility
Change history
- 2026-10-02 Added Terabit HPC Bubble, INFN-CNAF's H100 cluster in Bologna
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 and part | AMD EPYC 9004 (Genoa), NVIDIA InfiniBand NDR (Quantum-2) |
| infn.it | 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.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.