Nebul puts 1,000+ liquid-cooled Blackwell Ultra GPUs in Belgium

European AI cloud provider Nebul has contracted more than 1,000 liquid-cooled Nvidia Blackwell Ultra GPUs for its second data center location, at Datacenter United's campus in Machelen, Belgium. Lenovo will supply the hardware, deployed as GB300 NVL72 rack-scale systems in what Nebul is calling a new 'SuperCluster.'

For Nebul's customers, the deployment means European-hosted capacity at the very top of Nvidia's current lineup, without shipping workloads to US hyperscalers. It's the Leiden-based neocloud's second site and its first move into Belgium.

"This is a defining moment for Europe's ambitions in AI," said Arnold Juffer, CEO of Nebul. "Organizations want to amplify what they can achieve without giving up control over the intelligence they build. The demand is there, and it is larger than the capacity Europe is building today."

Juffer added: "With more than 1,000 Nvidia Blackwell Ultra GPUs as a part of GB300 NVL72 rack-scale systems in Belgium, and Datacenter United, Lenovo and Nvidia as partners, we are delivering on that demand. And this Belgium deployment is a next step."

Who is Nebul?

Nebul is a private AI cloud provider headquartered in Leiden, South Holland. Its platform offers Nvidia hardware across the DGX, HGX, OVX and RTX lines, with GPUs spanning the B300, B200, H200, H100, L40S and L4. In June 2024 the company raised €20 million ($22.7m) in a funding round — roughly enough, at list prices, for a few dozen high-end racks, which underlines why capacity partnerships now matter more than balance sheets.

Earlier this year, Nebul also announced it would become the first cloud platform to offer Speedata's Analytics Processing Units (APUs), extending its portfolio beyond Nvidia silicon.

What does the host bring to the table?

Datacenter United, founded in 2010, operates 14 data centers across 12 locations in Belgium. TINC acquired a 75 percent equity interest in the operator in 2020, and Cordiant — since rebranded Corilis — took a stake in 2024.

"Europe's AI ambitions depend on more than computing power alone. They require reliable, high-density infrastructure that can support the next generation of AI workloads," said Friso Haringsma, CEO of Datacenter United.

Haringsma continued: "Nebul's decision to establish its new SuperCluster in Machelen demonstrates that Belgium has a meaningful role to play in Europe's AI development. By providing the power, connectivity and advanced liquid-cooling infrastructure required for this deployment, we are helping turn those ambitions into reality."

Why liquid cooling matters here

GB300 NVL72 systems are rack-scale designs, and 1,000-plus GPUs of that class draw far more power per rack than air cooling can handle. The host's liquid-cooling capability is therefore not a nice-to-have — it's the enabling condition for the whole deployment, and a key part of why Machelen won the deal over larger European markets.

For practitioners shopping for European AI capacity, the takeaway is simple: another thousand-GPU-class Blackwell Ultra footprint is coming online inside the EU's regulatory perimeter, operated by a provider whose pitch is data control rather than raw scale.