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 pricing, capacity, power, fabric, and latency across 240+ facilities and 40+ operators into a single queryable graph for AI agents, traders, and procurement teams.

Facility	Operator	Location	GPU	MW	PUE
Global Switch TALLINN1 East	Global Switch	Tallinn, Estonia	—	3	1.26
Hetzner TALLINN2 East	Hetzner	Tallinn, Estonia	—	15	1.28
Aruba TALLINN3 Central	Aruba	Tallinn, Estonia	—	15	1.27
Bulk Infrastructure TALLINN4 South	Bulk Infrastructure	Tallinn, Estonia	—	6	1.49
Global Switch TALLINN5	Global Switch	Tallinn, Estonia	—	13	1.23
Hetzner TALLINN6 South	Hetzner	Tallinn, Estonia	H200	7	1.46
Digital Realty / Interxion TALLINN7 East	Digital Realty / Interxion	Tallinn, Estonia	MI300X	13	1.25
NTT TALLINN8 North	NTT	Tallinn, Estonia	A100	2	1.40
Global Switch TALLINN9 Annex	Global Switch	Tallinn, Estonia	A100	7	1.48

AI Datacenters in

Company → Datacenter → GPU → Customer → Industry