At a glance
Platform Summary
Built by Flex in Milpitas CA; 44 GB on-wafer SRAM and no HBM. See AI Inference.
| Item | Value |
|---|---|
| Designer | Cerebras |
| Accelerator | WSE-3 wafer-scale engine |
| Host CPU | Not disclosed |
| Accelerators per unit | 1 (System) |
| Scale-up fabric | SwarmX |
| Scale-out fabric | Not disclosed |
| Cooling | Liquid |
| Power (kW) | About 23 per system |
| Status | Shipping, volume from 2024 |
Supplier ring
Who Makes Each Component
| Component | Supplier | Role | Made in | US status | Evidence | Notes |
|---|---|---|---|---|---|---|
| Accelerator | TSMCWSE-3; 5 nm | Sole | Taiwan | Made abroad | Committed Source | S-1 names TSMC as the sole foundry; fab site not disclosed |
| CPU | Not disclosed | Primary | Not disclosed | Claimed | Host x86 servers sit outside the CS-3; vendor not disclosed | |
| HBM | Not applicableOn-wafer SRAM; no HBM | Sole | Not disclosed | Committed Source | WSE-3 uses 44GB of on-chip SRAM and no HBM | |
| Advanced packaging | Not disclosedcontract manufacturers | Primary | Not disclosed | Committed Source | S-1 says contractors package and some sit outside the US | |
| PCB and substrate | Not disclosed | Primary | Not disclosed | Claimed Source | Systems deploy in US sites such as the 10 MW Oklahoma City data center | |
| Compute tray ODM | Flex | Primary | United StatesFlex, Milpitas CA | Made in US | Committed Source | Dedicated CS-3 lines targeting about 7x capacity through 2026 |
| Rack integration | Flex | Primary | United StatesFlex, Milpitas CA | Made in US | Committed Source | Full-rack qualification plus burn-in and test in Milpitas |
| Scale-up switch | Not disclosed | Primary | Not disclosed | Claimed | SwarmX fabric hardware vendor not disclosed | |
| Scale-up cabling | Not disclosed | Primary | Not disclosed | Claimed | ||
| Scale-out NIC | Not disclosed | Primary | Not disclosed | Claimed | ||
| Optical transceivers | Not disclosed | Primary | Not disclosed | Claimed Source | Flex validates optical networking in Milpitas; module vendor not disclosed | |
| Power shelf | Not disclosed | Primary | Not disclosed | Claimed | Flex does the high-power electrical integration in Milpitas | |
| Rack busbar and power distribution | Not disclosed | Primary | Not disclosed | Claimed | ||
| Battery backup and capacitors | Not disclosed | Primary | Not disclosed | Claimed | ||
| Coolant distribution unit | Not disclosed | Primary | Not disclosed | Committed Source | S-1 says cooling units are bought from third parties | |
| Cold plates and manifolds | Not disclosed | Primary | Not disclosed | Committed Source | Flex installs liquid cooling in Milpitas CA; where the parts are made is not disclosed | |
| Quick disconnects | Not disclosed | Primary | Not disclosed | Claimed | ||
| Rack enclosure | Not disclosed | Primary | Not disclosed | Committed Source | Flex assembles racks in Milpitas CA; enclosure maker and country not disclosed |
US share
What Is Made in the US
- Compute tray ODM: Flex, Flex, Milpitas CA. Made in US.
- Rack integration: Flex, Flex, Milpitas CA. Made in US.
Record
Dataset Record
- Dataset
- Supplier ring for Cerebras CS-3: 18 rows across 18 components
- Sources
- Company filings and press releases, SemiAnalysis, TrendForce, DigiTimes, KGI and Morgan Stanley via Taiwan press, Nvidia, AMD, Google, AWS, Microsoft, Cerebras; source link on each row
- Last verified
- October 2026