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System architecture

Four systems, drawn together.

Power, cooling, compute, and controls are specified as one assembly, so the interfaces between them are fixed before anything is fabricated.

Flow

Site inputs through to compute.

  1. Site

    Site inputs

    Everything the site brings. The service sets the configuration, and the jurisdiction sets the schedule.

    • Land and pad
    • Electrical service
    • Fibre
    • Permits
  2. Power

    Nawa infrastructure

    The manufactured part. Built, wired, plumbed, and tested on a factory floor, then shipped as units.

    • Power distribution
    • Coolant distribution
    • Heat rejection
    • Racks
    • Controls
  3. Controls

    Operations layer

    What the assembly reports about itself. Its condition and the energy it draws, plus a log of who opened which door.

    • Monitoring
    • Alerting
    • Metering
    • Access control
  4. Compute

    Outputs

    The workloads the racks carry once the assembly is commissioned.

    • Inference
    • Training
    • Fine-tuning
    • Private capacity

Yard 400 subsystems

The reference configuration.

Yard 400 carries the full scope. Campus 7.5 and Module 20 change what sits inside the boundary, and each model page states its own.

Power

Power

Service enters the 40 ft unit and leaves as a busbar feed to the racks.

Design basis

  • Two uninterruptible supplies at 400 kVA, N+1
  • Sixteen lithium storage cabinets at 563 V
  • 48 V busbar to the racks
  • Two room cooling units at 26.9 kW hold the electrical space

Redundancy

The uninterruptible supplies are an N+1 pair. The unit carries its rating with one out of service.

Configuration options

Storage duration Reference design
Set by the cabinet count. Sixteen is the drawn configuration.
Service voltage Concept
Selected with the utility at interconnection.
Cooling

Cooling

Water carries the heat out of the IT unit and rejects it from the third.

Design basis

  • Three coolant distribution units at 160 kW, direct to chip
  • Three in-row cooling units at 30.5 kW
  • Chiller plant designed for 500 kW
  • Cold storage tank and an N+1 pump set

Redundancy

The pump set is N+1. Coolant distribution is drawn as three units against the rack load.

Configuration options

Ambient design range Concept
The plant is selected against the ambient at the site. The drawn configuration assumes a temperate range.
Compute

Compute

Five racks arrive integrated and tested inside the IT unit.

Design basis

  • 5 racks
  • 112 trays at 4 accelerators each
  • 448 accelerators
  • Liquid-cooled, fed from the 48 V busbar

Redundancy

Compute is not redundant. Power and cooling around it are.

Configuration options

Tray population Reference design
The schedule is three racks at 26 trays and two at 17. Racks can ship part-populated and fill later.
Controls

Controls and safety

The yard reports its own condition and puts itself out if it has to.

Design basis

  • Environmental monitoring across all three units
  • Leak detection at the coolant loop
  • Access control at every door
  • Clean-agent suppression, total flood

Redundancy

Detection is independent of the control system, so a controls fault does not blind the alarm path.

Configuration options

Suppression agent Concept
Set by the jurisdiction. The drawn configuration carries a clean agent in every unit.

Yard 400 specification

Terms

Glossary.

CDU Coolant distribution unit
Sits between the rack loop and the facility loop. It holds the water going to the chips at a set temperature and keeps the two loops separate.
UPS Uninterruptible power supply
Carries the load through a utility interruption long enough for the site to ride through or transfer.
N+1 One spare beyond need
A redundancy model. The system meets its rating with one unit out of service.
Direct to chip Direct-to-chip liquid cooling
Cold plates sit on the processors and carry heat away in water. Air handles what is left.
Interconnection Utility interconnection
The agreement and physical connection that lets a site draw power from the grid at a given capacity.
Tier III Concurrently maintainable topology
A data center topology standard. Every capacity component and distribution path can be taken out for service without stopping the load.

Next

Review a configuration against a site.

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