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
STACK Infrastructure ASHBURN81 Central	STACK Infrastructure	Ashburn, VA, USA	B200	36	1.26
STACK Infrastructure ASHBURN87	STACK Infrastructure	Ashburn, VA, USA	—	51	1.34
STACK Infrastructure DALLAS29 North	STACK Infrastructure	Dallas, TX, USA	—	30	1.21
STACK Infrastructure CHICAGO31 South	STACK Infrastructure	Chicago, IL, USA	A100	24	1.23
STACK Infrastructure CHICAGO32 West	STACK Infrastructure	Chicago, IL, USA	—	23	1.52
STACK Infrastructure CHICAGO35 West	STACK Infrastructure	Chicago, IL, USA	A100	24	1.22
STACK Infrastructure NEW53 Park	STACK Infrastructure	New York, NY, USA	—	3	1.40
STACK Infrastructure NEW56 Campus	STACK Infrastructure	New York, NY, USA	H200	4	1.40

STACK Infrastructure LOS11 Annex

Company → Datacenter → GPU → Customer → Industry