Poland · operational · mixed

Lem

Also known as WCSS Lem

Operated by WCSS at WCSS Data Centre (Wroclaw) .

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: 12.80 PFlop/s
Rpeak: 20.37 PFlop/s
Rmax ÷ Rpeak: 62.8%
Cores: 44,992
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	- Dell (TOP500 manufacturer)	Dell Technologies DELLNYSE	-	Reported	top500.org
Accelerator	NVIDIA H100 SXM5 94GB Accelerators CUDA (Hopper GH100) · 16,896C · 1.98 GHz · TSMC 4N · 700 W NVIDIA H100 94GB SXM5; 304 accelerators on 76 GPU nodes per WCSS	NVIDIA NVDANASDAQ	304 reported	Reported	top500.org wcss.pl
CPU	Intel Xeon Platinum 8462Y+ CPUs x86-64 · 32C · 2.8 GHz · Intel 7 Intel Xeon Platinum 8462Y+ 32C 2.8GHz	Intel INTCNASDAQ	-	Reported	top500.org
Interconnect	NVIDIA InfiniBand NDR (Quantum-2) Interconnect Fat tree or dragonfly+ · 400 Gb/s per port · Under 0.6 microseconds InfiniBand NDR200 (4x NDR 200 Gb/s on GPU nodes)	NVIDIA NVDANASDAQ	-	Verified	top500.org wcss.pl

The read

Flagship cluster of the Wroclaw Centre for Networking and Supercomputing (WCSS), launched in 2024 and ranked 80th on the June 2024 TOP500. WCSS describes a CPU partition of 188 nodes (23,808 cores, 279 TB RAM) and a GPU partition of 76 nodes with 304 NVIDIA H100 accelerators linked by NVLink, plus 64 service nodes, InfiniBand NDR200 on the compute nodes, about 21 PFlops total and 2 PB NFS, 2 PB Lustre and 6 PB S3 storage; funding came in part from the EuroHPC PL and CLARIN-PL-BIZ projects. TOP500 lists a Dell system with Intel Xeon Platinum 8462Y+ 32-core 2.8 GHz CPUs, NVIDIA H100 94 GB SXM5 and InfiniBand NDR200 under AlmaLinux 9.3: 44,992 cores, Rmax 12.80 PFlop/s, Rpeak 20.37 PFlop/s. Its TOP500 history is 80th (June 2024), 99th (November 2024), 121st (June 2025), 141st (November 2025) and 162nd (June 2026). WCSS gives the H100 memory as 96 GB where TOP500 says 94 GB.

Timeline

2024 First operational source
2024-06 List debut at #80 (June 2024) source

Public list appearances

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

#80: TOP500, June 2024 →

Site & facility

WCSS Data Centre (Wroclaw)

Location: Wroclaw, Poland

wcss.pl

Change history

2026-10-02 Added Lem, WCSS's H100 cluster in Wroclaw

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.

One cited source was readable and does not mention this system; another could not be read because the host returned a bot challenge. The unreadable one may well be fine, so this is weaker evidence than a corroborated row and much stronger than an unsupported one. See how this check works.

Cited source	Result	Found on the page
top500.org	does not name this system	Intel Xeon Platinum 8462Y+, NVIDIA H100 SXM5 94GB, NVIDIA InfiniBand NDR (Quantum-2)
wcss.pl	could not be fetched	-

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

Lem