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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.

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SpecAMD Instinct MI355XEl Capitan
Accelerator—AMD Instinct MI300A (APU)
Bf16 Matrix Pflops Dense2.5—
Bf16 Matrix Pflops Sparse5—
Compute Units256—
Coolingdirect liquid cooling (air-cooled option available)—
Cores—11,340,000
CPU—AMD 4th Gen EPYC 24C 1.8GHz
Form factorOAM—
Fp16 Matrix Pflops Dense2.5—
Fp16 Matrix Pflops Sparse5—
Fp32 Vector Tflops157.3—
Fp64 Matrix Tflops78.6—
FP8 Matrix Pflops Dense5—
FP8 Matrix Pflops Sparse10.1—
HBM (GB)288—
HBM TypeHBM3E—
Helios Gpus PER Rack72—
Hpcg Tflops—17,406
Installation Year—2,024
Interconnect—HPE Slingshot-11
Location—DOE/NNSA/Lawrence Livermore National Laboratory
Manufacturer—HPE
Memory bandwidth (TB/s)8—
Model—HPE Cray EX255a
Mxfp4 Matrix Pflops10.1—
Mxfp6 Matrix Pflops10.1—
Pcie GEN5—
Power KW—29,684.62
Process Node NM3—
Rmax Pflops—1,809
Rpeak Pflops—2,821.1
Successor Cdna Version5—
Successor FamilyAMD Instinct MI400 Series (MI455X)—
Successor Launch2026-07-23—
Successor Mi455x Bandwidth TB S23.3—
Successor Mi455x Hbm4 GB432—
TBP Watts1,400—
Top500 Jun2026 NO1—LineShine (National Supercomputing Centre in Shenzhen, China)
Top500 Rank Jun2026—2
Top500 Rank Nov2024—1
Top500 Rank Nov2025—1