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

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

Rig A

NVIDIA · accelerator

Change

Rig B

AMD · accelerator

Change

0 of 38 fields comparable

Spec	NVIDIA HGX B200	AMD Instinct MI355X
Bf16 Matrix Pflops Dense	—	2.5
Bf16 Matrix Pflops Sparse	—	5
Compute Units	—	256
Cooling	—	direct liquid cooling (air-cooled option available)
Form factor	—	OAM
Fp16 Bf16 Pflops	36	—
Fp16 Matrix Pflops Dense	—	2.5
Fp16 Matrix Pflops Sparse	—	5
FP32 TFLOPS	600	—
Fp32 Vector Tflops	—	157.3
FP4 Pflops Dense	72	—
FP4 Pflops Sparse	144	—
Fp64 Matrix Tflops	—	78.6
FP64 TFLOPS	296	—
FP8 FP6 Pflops	72	—
FP8 Matrix Pflops Dense	—	5
FP8 Matrix Pflops Sparse	—	10.1
Gpus	8	—
HBM (GB)	—	288
HBM Type	—	HBM3E
Helios Gpus PER Rack	—	72
Int8 Pops	72	—
Memory bandwidth (TB/s)	—	8
Mxfp4 Matrix Pflops	—	10.1
Mxfp6 Matrix Pflops	—	10.1
Networking Bandwidth TB S	0.8	—
Nvlink Generation	5	—
Nvlink GPU TO GPU TB S	1.8	—
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
Total HBM GB	1,400	—
Total Nvlink Bandwidth TB S	14.4	—