Supercomputers/Systems/Discoverer
Bulgaria · operational · hpc
Discoverer
Operated by Sofia Tech Park at Sofia Tech Park .
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
- 4.52 PFlop/s
- Rpeak
- 5.94 PFlop/s
- Rmax ÷ Rpeak
- 76.1%
- Cores
- 144,384
- 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 | - Atos BullSequana XH2000 | Eviden | - | Verified | eurohpc-ju.europa.eutop500.org |
| Accelerator | NVIDIA H200 SXM Accelerators CUDA (Hopper GH100) · 16,896C · 1.98 GHz · TSMC 4N · 700 W 32 NVIDIA H200 GPUs in four DGX H200 nodes | NVIDIA | 32 reported | Reported | docs.discoverer.bgeurohpc-ju.europa.eu |
| CPU | AMD EPYC 7H12 (Rome, high frequency) CPUs x86-64 · 64C · 2.6 GHz · 7 nm · 280 W Two AMD EPYC 7H12 64C per node, 1,128 nodes | AMD | - | Reported | docs.discoverer.bgtop500.org |
| Interconnect | NVIDIA InfiniBand HDR Interconnect Fat tree or dragonfly+ · 200 Gb/s per port · About 0.6 microseconds InfiniBand HDR, ConnectX-6 at 200 Gb/s | NVIDIA | - | Reported | docs.discoverer.bgtop500.org |
The read
Bulgaria's EuroHPC system at Sofia Tech Park, an Eviden BullSequana with AMD EPYC 7H12 CPUs, ranked 91st in June 2021. The operator's documentation adds a four-node NVIDIA DGX H200 partition of 32 GPUs. The installation year is TOP500's; no announcement or funder is on the pages we could fetch. TOP500 is the only source for Rmax, Rpeak and core count, so 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.
Site & facility
Change history
- 2026-09-20 Added with a rank pointer on the edition where it ranked highest
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 |
|---|---|---|
| eurohpc-ju.europa.eu | names system, part and count | AMD EPYC 7H12 (Rome, high frequency), NVIDIA H200 SXM, NVIDIA InfiniBand HDR · counts: 32 |
| top500.org | names system and part | AMD EPYC 7H12 (Rome, high frequency), NVIDIA H200 SXM, NVIDIA InfiniBand HDR |
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.