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 36 fields comparable

Spec	NVIDIA GB200	AMD Instinct MI355X
Bf16 Matrix Pflops Dense	—	2.5
Bf16 Matrix Pflops Sparse	—	5
Blackwell Gpus	2	—
Compute Units	—	256
Cooling	—	direct liquid cooling (air-cooled option available)
CPU Memory Bandwidth GB S MAX	512	—
CPU Memory Lpddr5x GB MAX	480	—
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
FP8 Pflops	20	—
Grace Cpus	1	—
HBM (GB)	—	288
HBM Bandwidth TB S	16	—
HBM Type	—	HBM3E
Helios Gpus PER Rack	—	72
Memory bandwidth (TB/s)	—	8
Mxfp4 Matrix Pflops	—	10.1
Mxfp6 Matrix Pflops	—	10.1
Nvfp4 Pflops Dense	20	—
Nvfp4 Pflops Sparse	40	—
Nvlink Bandwidth TB S	3.6	—
Nvlink C2C Bandwidth GB S	900	—
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 Hbm3e GB	372	—