Cerebras CS-3
The Cerebras CS-3 is a single 16 RU liquid-cooled system built around one Wafer Scale Engine 3, drawing up to 27 kW. Its memory is 44 GB of on-chip SRAM running at 21 PB/s, with no DRAM of any kind, and system I/O is 1.2 Tb/s. Cerebras rates it at 125 petaFLOPS of FP16, but a footnote on its own datasheet states that FLOPS are shown as sparse, and the sparsity is unstructured rather than 2:4 structured, so no dense equivalent can be derived by halving and none is published. This entry therefore carries no precision figures rather than a sparse number that would be compared against the dense figures used everywhere else on this site. Cooling is water at 100 L/min per system, 20 +/- 2 C, with 50 um filtering and PG25 chemistry.
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System Details
GPU Configuration
System Specifications
Powered by Cerebras WSE-3
This system utilizes 1 × 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
Frequently asked questions
How much does the CS-3 cost?
Cerebras sells the CS-3 on quote through OEMs and resellers, and Flopper has no live rental listing for its WSE-3 accelerator to derive an hourly figure from. System rental pricing →
How much power does the CS-3 require?
Cerebras rates the CS-3 at 27 kW, which is the figure to plan power delivery and cooling around; per-GPU draw is listed on the accelerator's own page.
How many GPUs are in the CS-3?
1. The CS-3 carries 1 Cerebras WSE-3 accelerators in a rack form factor, and every throughput figure on this page is the total across them. WSE-3 specifications →
Documentation & Resources
Need this system?
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Flopper Spec Sheet
Cerebras CS-3 specifications, generated from our database. Printable.
Vendor product page
Cerebras CS-3 documentation
Cerebras CS-4 datasheet
Cerebras • 2026-08-18
Typical Use Cases
The Cerebras CS-3 runs 1× WSE-3 GPUs over 1.2 Tb/s system I/O; 214 Pb/s on-wafer fabric.