NVIDIA Blackwell Ultra: up to 140 kW per rack, mandatory liquid cooling — European datacenters on notice
By Lila Benhammou, Co-Founder & CIO — FINXIA Capital
NVIDIA just unveiled the Blackwell Ultra, its new generation of GPU dedicated to generative AI. With up to 140 kW per rack and a mandatory liquid cooling requirement, the message is clear: European datacenters that haven't anticipated this transition will be obsolete before 2027. FINXIA Capital analyzes the implications for investors.
The numbers are unambiguous. A Blackwell Ultra rack draws up to 140 kW, equivalent to 700 French households. A bay of 20 racks is nearly 3 MW. A 50-bay datacenter is around 140 MW. To give an idea, France currently has 18 GW of datacenter demand in queue with RTE. Blackwell Ultra alone could absorb 20% of this capacity.
But the real challenge isn't raw power — it's cooling. Traditional forced air cooling reaches its physical limits at 40-50 kW per rack. Beyond that, only liquid cooling can maintain operational temperatures. NVIDIA designed the Blackwell Ultra rack with mandatory direct-to-chip liquid cooling — air alone is no longer sufficient. This represents a 15% to 25% additional cost on the initial investment.
The Technology Shock: When the GPU Redesigns the Building
Existing European datacenters weren't designed for this density. Most data centers built before 2023 use air cooling with PUE of 1.4 to 1.6. A typical brownfield datacenter in France consumes 1.8 MW and has 2,000 m² of space. To host Blackwell Ultra, server density would need to be reduced by 70% and liquid cooling loops installed — a transformation costing between 3 and 5 million euros.
This is precisely where the brown-to-green opportunity lies. Existing poorly optimized assets, with a solid electrical connection but obsolete cooling infrastructure, can be transformed into high-density platforms for 40% less than building an equivalent greenfield. FINXIA Capital has identified 12 sites in France and Spain matching this profile.
The Race for Electrical Connection Accelerates
RTE, France's transmission system operator, confirmed that nearly 18 GW of capacity is reserved for some 80 datacenter projects — up from 5 GW at end-2024. Connection lead times reach 5 to 7 years in some regions, versus 2 to 3 previously. Datacenters powered by next-generation GPUs will be prioritized for fast connections, as they generate revenues per MW far higher than traditional industrial uses.
Germany and the Netherlands face the same tension. Amsterdam suspended new datacenter projects in 2019 before imposing strict siting rules — eased in 2024. Frankfurt, European capital of cloud, is seeing industrial electricity prices rise sharply, according to FINXIA Capital estimates. In this context, brown sites with an existing connection and valid operating permit are worth their weight in gold.
The Investment Thesis: The Liquid Cooling Premium
FINXIA Capital integrates Blackwell Ultra compatibility as a mandatory selection criterion in its TITAN DC AI strategy. A datacenter capable of hosting 140 kW racks with liquid cooling commands rents 30% to 50% higher than traditional air-cooled datacenters. Hyperscalers — Microsoft, Google, Amazon — already pay this premium for their HPC contracts.
The calculation is simple. A 10 MW brown site, transformed for liquid cooling with a target PUE of 1.15, generates 2.5 million euros in annual revenue versus 1.8 million in air configuration. Transformation cost is 4 million euros. Payback period drops to 3.2 years. This is the sweet spot that institutional investors are targeting.
What Investors Must Understand
NVIDIA doesn't just manufacture GPUs — it redesigns the physical infrastructure that hosts them. Each GPU generation doubles energy density and imposes new cooling constraints. Datacenters that can't keep up with this curve will become energy sieves that nobody wants. Technological obsolescence is the number one risk of datacenter investment in 2026.
The investment window is 2026-2027. By 2028, liquid cooling-compatible sites will be rare and expensive. Whoever transforms now will capture the first-mover premium. This is the conviction guiding FINXIA Capital in its TITAN DC AI deployment.
Lila Benhammou is Co-Founder and Chief Investment Officer (CIO) of FINXIA Capital SCSp, a Luxembourg proprietary investment vehicle positioned on real assets and AI infrastructure.