Castellan · Services · HPC Hosting
Service 07 — HPC Hosting & Colocation

Your hardware. Our racks, power, and uptime.

Castellan hosts GPU and HPC systems — from single HGX servers to complete NVL72-class racks — in data centres across Europe and beyond. High-density racks, redundant power, cooling engineered for accelerated hardware, and hands-on operations around the clock. You keep ownership of the machines; we keep them running.

Europe+
Data-centre locations in Europe and beyond
130+kW
Rack densities up to NVL72-class deployments
24/7
Monitoring, operations & remote hands
DLC-ready
Air & direct-liquid cooling for H100 → GB300
01
What's included

GPU-grade colocation, not generic rack space.

Accelerated hardware breaks the assumptions of classic colocation: an HGX H100 server draws more than many full legacy racks, and NVL72 systems require facility-level liquid cooling. Castellan places your systems in facilities engineered for exactly this class of hardware — and operates them as if they were our own.

  • 01
    Rack space & power
    High-density racks with redundant, metered power feeds — sized for 10 kW legacy systems up to 130+ kW NVL72-class racks.
  • 02
    Cooling for accelerators
    Air, rear-door heat exchangers, and direct-liquid cooling — matched to your systems, from H100/H200 air-cooled servers to GB200/GB300 liquid-cooled racks.
  • 03
    Network & interconnect
    Redundant transit, private interconnects, and low-latency cross-connects — plus InfiniBand-ready cabling inside your deployment.
  • 04
    Remote hands & lifecycle
    Installation, burn-in, component swaps, firmware and lifecycle management — 24/7, by engineers who work with this hardware daily.
02
Why host with Castellan

Six reasons owners bring their systems to us.

01
Energy-advantaged pricing
Power priced off industrial energy positions — on hardware where electricity is the dominant cost of ownership.
02
GPU-grade facilities
Densities, cooling, and floor loading specified for accelerated hardware — no retrofitting, no compromises.
03
European jurisdiction
Locations under EU and Swiss legal regimes, GDPR/revFADP-aligned operations — with reach beyond Europe where you need it.
04
Fast onboarding
From signed order to energised systems in weeks — logistics, staging, installation, and acceptance handled by one team.
05
Monetize idle time
Hosted systems can join our compute monetization network: contracted offtakers buy your idle GPU-hours, turning cost into yield.
06
A path to scale
Grow from hosted racks to dedicated halls to a full Castellan powered shell — one platform, no re-platforming.
03
Engagement

Straightforward terms, institutional operations.

Hosting engagements run from a single system to multi-rack deployments, with transparent power pass-through and defined service levels. Combined with procurement (we source and deliver the hardware) and monetization (we sell your idle capacity), Castellan covers the full lifecycle of AI hardware ownership.

Scale
Single servers · rack deployments · multi-rack clusters
Supported systems
NVIDIA H100 · H200 · B200 HGX servers · GB200/GB300 NVL72 racks · storage & networking
Locations
Data centres across Europe · further locations on request
Power & billing
Metered power pass-through · transparent monthly reporting
Operations
24/7 monitoring · remote hands · SLA-backed response times
Options
Idle-time monetization · hardware procurement & refresh · managed operations
04
Hosting enquiry

Tell us about your systems.

Describe your hardware, preferred location, and timeline — we come back with available capacity, power pricing, and an onboarding plan. Prefer email? contact@castellan-intelligence.com