Talk Around Town: Germany's KIT Says Its New 33-Petaflop HoreKa 2 Is a Green AI Beast

What Folks Are Sayin' Down at the Feed Store

Word spreadin' faster than kudzu through the HPC world is that Germany's Karlsruhe Institute of Technology — KIT, for those of us who can't pronounce the whole thing after two sweet teas — flipped the switch on a shiny new supercomputer called HoreKa 2 on September 25, 2026, out at Campus North in Eggenstein-Leopoldshafen. Multiple independent outlets, including Data Center Dynamics and Hardwareluxx, are all hollering the same tune, so this part ain't just barn-talk.

KIT says this machine is somethin' special: a hybrid monster the institute describes as hauling roughly 33 petaFLOPS of peak compute, which KIT claims is about double the horsepower of the original HoreKa it put to pasture back in 2021. The institute also says the whole shebang runs on 100% renewable electricity, framing HoreKa 2 as proof that you can chase AI-era computing without burnin' the planet down like a pile of dry brush.

What We Actually Know for Certain-Sure

Here's what multiple independent sources — KIT's own press release, Data Center Dynamics, Bebeez.eu, Hardwareluxx, Borncity, Forschung und Wissen, and InsideBW — all agree on, like neighbors at a church potluck: KIT inaugurated HoreKa 2 on September 25, 2026, at Campus North. The system carries a €17 million (~$19 million USD) price tag and is the direct follow-up to the original HoreKa, a 17-petaflop machine that went live in 2021.

The hardware lineup is confirmed by multiple specialist outlets: Lenovo built the whole rig, with a CPU partition using Lenovo SD665 V3 servers loaded with AMD EPYC 9655 'Turin' processors, and a GPU partition riding Lenovo ThinkSystem SC777 V4 servers equipped with Nvidia GB200 GPUs strung together over NVLink. The system packs more than 42,000 processor cores, some 300 AI accelerators, and around 250 terabytes of RAM — which is more memory than most folks have room for thoughts.

The GPU partition cools itself with what Lenovo calls Neptune hot-water liquid cooling, a setup that Data Center Dynamics reports enables free cooling year-round. KIT is confirmed to be one of nine centers in Germany's National High-Performance Computing Network, meaning researchers from all disciplines across the country — not just KIT's own people — can line up to use it. Target research areas KIT lists include climate science, materials, particle physics, energy, mobility, health, and AI.

What Ain't Been Nailed Down Yet

Now hold your horses, because the barn door's still open on a couple of big claims. Hardwareluxx — and only Hardwareluxx, bless its heart — estimates HoreKa 2 might land somewhere around 70th place on the Top500 list of the world's most powerful supercomputers. That ranking is purely an educated guess from a single specialist outlet; Top500.org has not confirmed it, and the list won't see its next update until the SC26 conference rolls into Chicago in November 2026. So that number is about as official as a handshake deal on a dirt road.

KIT's own press release claims HoreKa 2 is among the most energy-efficient supercomputers in its performance class worldwide — which would be a heck of a trophy if it holds up. But as of publication, no independent Green500 benchmark has validated that claim. KIT says it; nobody outside of KIT has checked the math with a ruler yet. Separately, sources don't fully agree on the exact breakdown of the CPU, GPU, and potentially ARM-based sub-partitions — Hardwareluxx mentions Nvidia Grace processors for an energy-efficiency partition, while Bebeez and Data Center Dynamics describe things somewhat differently, suggesting the hybrid architecture may be more layered than a stack of grandma's biscuits.

Our Analysis: Why This Matters Even With the Murk

Analysis, not reporting: Even setting aside the unconfirmed ranking and the self-reported efficiency crown, HoreKa 2 represents something genuinely worth watching in the European HPC landscape. The hardware pairing of Nvidia GB200 GPUs with AMD EPYC 'Turin' CPUs inside a Lenovo-built hybrid chassis is exactly the kind of architecture that the AI-era compute world has been gravitating toward — and KIT deploying it at national-research scale, tied to a renewable energy mandate, is a data point worth filing away.

Analysis, not reporting: Germany's NHR network model — spreading world-class compute across nine centers for nationwide researcher access — is a different philosophy than the American approach of a handful of titanic national labs. Whether HoreKa 2's final Top500 rank ends up at 70 or somewhere else entirely, the real story may be less about the scoreboard and more about whether this hybrid, sustainability-conscious template gets copied by other national research HPC centers. That's a question worth keeping an eye on come November 2026, when Top500 and potentially Green500 results will add some much-needed sunlight to these claims.