Germany · operational · mixed

HoreKa

Also known as Hochleistungsrechner Karlsruhe

Operated by Karlsruhe Institute of Technology .

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: 8.03 PFlop/s
Rpeak: 15.01 PFlop/s
Rmax ÷ Rpeak: 53.5%
Cores: -
Power: 358.79 kW
Per watt: 22.4 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 V2 (Blue) and SD650-N V2 (Green) nodes	Lenovo 992HKEX	-	Reported	top500.org
Accelerator	- 167 HoreKa Green nodes with four NVIDIA A100 40 GB each (quantity derived as 167 x 4)	NVIDIA NVDANASDAQ	668 reported	Reported	nhr.kit.edu top500.org
Accelerator	- 22 HoreKa Teal nodes with four NVIDIA H100 94 GB each on AMD EPYC 9354 hosts (quantity derived as 22 x 4)	NVIDIA NVDANASDAQ	88 reported	Reported	nhr.kit.edu
Accelerator	NVIDIA H200 SXM Accelerators CUDA (Hopper GH100) · 16,896C · 1.98 GHz · TSMC 4N · 700 W 13 Ruby nodes with four NVIDIA HGX H200 plus one Teal node with eight H200 (quantity derived as 13 x 4 + 8)	NVIDIA NVDANASDAQ	60 reported	Reported	nhr.kit.edu
CPU	- 610 HoreKa Blue nodes with Intel Xeon Platinum 8368 38C 2.4 GHz (76 cores per node; quantity is nodes)	Intel INTCNASDAQ	610 reported	Verified	nhr.kit.edu top500.org
Interconnect	NVIDIA InfiniBand HDR Interconnect Fat tree or dragonfly+ · 200 Gb/s per port · About 0.6 microseconds InfiniBand 4X HDR 200 Gb/s on all nodes	NVIDIA NVDANASDAQ	-	Verified	nhr.kit.edu top500.org

The read

Karlsruhe Institute of Technology's national NHR supercomputer, a Lenovo ThinkSystem SD650 V2 machine. The KIT documentation lists HoreKa Blue as 610 CPU nodes (Intel Xeon Platinum 8368, 76 cores per node) and HoreKa Green as 167 nodes with four NVIDIA A100 40 GB GPUs each (668 A100), with later Teal nodes (22 nodes with four H100 94 GB, plus one 8x H200 node) and Ruby nodes (13 nodes with four H200) added, all on 4X HDR 200 Gb/s InfiniBand. TOP500 lists the Green partition at 8.03 PFlop/s Rmax and 15.01 PFlop/s Rpeak (52nd on the June 2021 list) and Blue at 2.33 PFlop/s Rmax; the FLOPS figures in this row are the Green partition only. KIT's press release states a combined peak of 17 PFlop/s, an investment of 15 million euros and an inauguration on 2 August 2021. Both KIT and TOP500 confirm the CPU, the A100 GPUs and the InfiniBand HDR fabric.

Timeline

2021 First operational source
2021-06 List debut at #52 (June 2021) source

Public list appearances

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

#52: TOP500, June 2021 →

Change history

2026-10-02 Added HoreKa (Karlsruhe Institute of Technology)

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	NVIDIA InfiniBand HDR
nhr.kit.edu	names system, part and count	NVIDIA H200 SXM, NVIDIA InfiniBand HDR · counts: 60

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

Related news

2026-10-05 Germany’s Karlsruhe Institute of Technology unveils 33 petaflops HoreKa 2 supercomputer · Data Center Dynamics
KIT's HoreKa 2 goes operational as the successor to the HoreKa system already tracked in this graph, roughly doubling peak performance to 33 petaflops on a Lenovo-built hybrid of AMD Epyc Turin CPUs and Nvidia GB200 GPUs. A concrete data point for how NHR centers refresh hardware generations, and reason to update HoreKa's own system entry with the newer configuration.

All news →