Cerebras CS-3 Rack
The Cerebras CS-3 Rack packages two CS-3 systems into a single 48 RU cabinet measuring 600 mm by 1200 mm, drawing 54 kW in total: 50.4 kW carried by water and 3.6 kW by air. Networking is eight QSFP-DD transceivers at 4x100G, with a 1 GbE management port, a console port and a PoE flow controller interface. Power is 2+1 redundant at 240V/415Y, three phase, 60 A on IEC 60309 plugs, and water couples through 1.5 inch sanitary fittings with two pairs of supply and return. Between them the two engines hold 88 GB of on-chip SRAM and no DRAM. Cerebras publishes 125 petaFLOPS per engine but footnotes that figure as sparse, and the sparsity is unstructured, so no dense figure is derived.
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System Details
GPU Configuration
System Specifications
Powered by Cerebras WSE-3
This system utilizes 2 × Cerebras WSE-3 GPUs, each delivering exceptional performance for AI and HPC workloads.
Per GPU TDP
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Per GPU Memory
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Process Node
TSMC 5nm
Architecture
Wafer Scale Engine 3
Documentation & Resources
Flopper Spec Sheet
Cerebras CS-3 Rack specifications, generated from our database. Printable.
Vendor product page
Cerebras CS-3 Rack documentation
Cerebras CS-4 datasheet
Cerebras • 2026-08-18
Typical Use Cases
The Cerebras CS-3 Rack runs 2× WSE-3 GPUs over 8x QSFP-DD transceiver, 4x100G; 214 Pb/s on-wafer fabric per engine.