Question 1

What is an AI datacenter?

Accepted Answer

An AI datacenter is a facility purpose-built or retrofitted for GPU and accelerator workloads — typically at rack densities above 30 kW, with liquid-cooling readiness and high-bandwidth fabric (InfiniBand NDR, NVLink, or Spectrum-X). At least 40% of IT load runs AI training or inference on GPUs such as NVIDIA H100, H200, B200, or GB200 NVL72.

Question 2

Which datacenter has the most GPUs?

Accepted Answer

As of 2026, xAI Colossus in Memphis, Tennessee holds the title of the world's largest single-site GPU deployment, with more than 200,000 NVIDIA H100 and H200 GPUs in one InfiniBand domain. Meta Hyperion (Louisiana) and OpenAI Stargate Abilene (Texas) are scaling toward gigawatt-class deployments that will overtake it within the next 18 months.

Question 3

What is the largest AI cluster?

Accepted Answer

xAI Colossus is the largest contiguous AI training cluster in 2026, exceeding 200,000 NVIDIA H100/H200 GPUs on a single InfiniBand NDR 400G fabric. Meta's Hyperion build and OpenAI's Stargate program are constructing multi-site fabrics that will exceed one million accelerators across coupled campuses by 2027.

Question 4

Which GPU cloud is cheapest for H100?

Accepted Answer

On-demand: Together AI ($1.75/hr) and Voltage Park ($1.89/hr) lead. Reserved 1-year: Voltage Park ($1.20/hr) and Crusoe ($1.39/hr) are typically lowest. AWS p5 sits at the top of the price stack at ~$4.10/hr on-demand.

Question 5

How is Datacenter.computer different from a datacenter directory?

Accepted Answer

Datacenter.computer is an agent-readable intelligence layer, not a directory. It normalizes capacity, power, fabric and location across 833 sourced facilities and 40 operators into a single queryable graph for AI agents, traders and procurement teams.

Facility	Operator	Location	Status	Accelerators	Recorded MW	Confidence
Global Switch London 1	Global Switch	London, United Kingdom	Operational	Not publicly disclosed	Not disclosed	High
Global Switch London 2	Global Switch	London, United Kingdom	Operational	Not publicly disclosed	Not disclosed	High
Global Switch London 3	Global Switch	London, United Kingdom	Operational	Not publicly disclosed	Not disclosed	High
Green Mountain LON-East	Green Mountain	London, United Kingdom	Operational	Not publicly disclosed	Not disclosed	High
Iron Mountain LON-2 London	Iron Mountain Data Centers	London, United Kingdom	Operational	Not publicly disclosed	Not disclosed	High
EdgeConneX London	EdgeConneX	London, United Kingdom	Operational	Not publicly disclosed	Not disclosed	High
Keppel DC London	Keppel Data Centres	London, United Kingdom	Operational	Not publicly disclosed	Not disclosed	High
OVHcloud Erith (LON)	OVHcloud	London, United Kingdom	Operational	Not publicly disclosed	Not disclosed	High

AI Datacenters in

Company → Datacenter → GPU → Customer → Industry