Rack Density
Rack density is the amount of power provisioned to a single cabinet, measured in kilowatts per rack. Density determines which workloads a facility can host, and it has become the primary qualifying specification for AI and high performance computing deployments.
Rack density expresses how much power a single cabinet is provisioned to draw, and by extension how much heat must be removed from that footprint. It is the specification that determines what kind of workload a facility can actually host.
The range
Legacy enterprise environments were designed around a handful of kilowatts per cabinet. Modern general purpose colocation typically supports meaningfully more. AI and high performance computing deployments sit in a different regime entirely, requiring purpose built power distribution and liquid cooling.
Why it constrains facilities
Density is limited by the weakest element in the chain: power distribution to the cabinet, the cooling capacity available to that footprint, and in some cases structural floor loading. A facility can hold abundant total megawatts and still be unable to support a high density cabinet.
Why it matters for marketing
Density is the fastest qualifying or disqualifying number on any colocation facility page, and it is frequently missing entirely.
A buyer with a defined density requirement is scanning for one figure. If it is not on the page, they do not fill out a form to ask, they check the next provider. Publishing supported density per hall, alongside whether that requires liquid cooling, converts your facility page from a brochure into a qualification tool and dramatically improves the quality of the inquiries that do come through.
Common questions
What is a typical rack density in colocation?
Traditional enterprise colocation commonly runs in the range of five to ten kilowatts per cabinet. High density deployments run considerably higher, and AI training racks can require many multiples of that, which is the point at which air cooling stops being viable and liquid becomes necessary.
Why does rack density matter more than total capacity?
Because a facility with a low density ceiling physically cannot host a modern AI or HPC deployment regardless of how much floor space or total megawatt capacity it advertises. Density determines what workloads you can serve. Total capacity only determines how many of them.