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MCS · Rigs · Compare

Side-by-side, with the numbers that matter.

Two rigs, one table. Higher numbers win in cobalt; TDP and price flip.

Rig A

Cerebras Wafer-Scale Engine 3

Cerebras · accelerator

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Rig B

AMD Instinct MI355X

AMD · accelerator

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SpecCerebras Wafer-Scale Engine 3AMD Instinct MI355X
Bf16 Matrix Pflops Dense—2.5
Bf16 Matrix Pflops Sparse—5
Compute Units—256
Cooling—direct liquid cooling (air-cooled option available)
Cores900,000—
CS4 Introduced2026-08-18—
CS4 Wse3 Turbo Count3—
DIE Size MM246,225—
Fabric Bandwidth Pbit S214—
Form factor—OAM
Fp16 Matrix Pflops Dense—2.5
Fp16 Matrix Pflops Sparse—5
Fp32 Vector Tflops—157.3
Fp64 Matrix Tflops—78.6
FP8 Matrix Pflops Dense—5
FP8 Matrix Pflops Sparse—10.1
HBM (GB)—288
HBM Type—HBM3E
Helios Gpus PER Rack—72
Memory bandwidth (TB/s)—8
Memory Bandwidth PB S21—
Mxfp4 Matrix Pflops—10.1
Mxfp6 Matrix Pflops—10.1
ON Chip Sram GB44—
Pcie GEN—5
Peak AI Petaflops125—
Process NodeTSMC 5nm—
Process Node NM—3
Successor Cdna Version—5
Successor Family—AMD Instinct MI400 Series (MI455X)
Successor Launch—2026-07-23
Successor Mi455x Bandwidth TB S—23.3
Successor Mi455x Hbm4 GB—432
TBP Watts—1,400
Transistors Trillion4—
Wse3 Turbo Peak AI Petaflops250—