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

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

Rig A

AMD · accelerator

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Rig B

AWS · cloud-model

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0 of 43 fields comparable

Spec	AMD Instinct MI355X	AWS Trainium2
Bf16 Matrix Pflops Dense	2.5	—
Bf16 Matrix Pflops Sparse	5	—
Bf16 Tflops PER Chip	—	667
Chips PER Trn2 Instance	—	16
Chips PER Ultraserver	—	64
Compute Units	256	—
Cooling	direct liquid cooling (air-cooled option available)	—
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 Dense Petaflops PER Chip	—	1.3
FP8 Matrix Pflops Dense	5	—
FP8 Matrix Pflops Sparse	10.1	—
FP8 Sparse Petaflops PER Chip	—	5.2
HBM (GB)	288	—
HBM Bandwidth TB S PER Chip	—	2.9
HBM Capacity GB PER Chip	—	96
HBM Type	HBM3E	HBM3
Helios Gpus PER Rack	72	—
Memory bandwidth (TB/s)	8	—
Mxfp4 Matrix Pflops	10.1	—
Mxfp6 Matrix Pflops	10.1	—
Neuroncores PER Chip	—	8
Pcie GEN	5	—
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	—
Trainium3 GA	—	2025-12-02
Trainium3 HBM Bandwidth TB S	—	4.9
Trainium3 Hbm3e GB PER Chip	—	144
Trn2 Instance FP8 Petaflops	—	20.8
Trn2 Instance HBM TB	—	1.5
Trn3 Ultraserver FP8 Pflops	—	362
Trn3 Ultraserver MAX Chips	—	144
Ultraserver FP8 Petaflops	—	83.2
Ultraserver Total HBM Bandwidth TB S	—	185
Ultraserver Total HBM TB	—	6