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

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

Rig A

NVIDIA · gpu

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Rig B

AMD · accelerator

Change

0 of 36 fields comparable

Spec	NVIDIA GeForce RTX 4090 Founders Edition	AMD Instinct MI355X
Bandwidth GB S	1,008	—
Bf16 Matrix Pflops Dense	—	2.5
Bf16 Matrix Pflops Sparse	—	5
Budget Ceiling USD	2,000	—
Compute Capability Digits	89	—
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 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
MSRP (USD)↓ better	1,599	—
Mxfp4 Matrix Pflops	—	10.1
Mxfp6 Matrix Pflops	—	10.1
Pcie GEN	—	5
Process Node NM	—	3
Production END Reported	2024-10	—
RTX 4090 Model	4,090	—
RTX 5090 Model	5,090	—
Status	discontinued (no longer sold new by NVIDIA)	—
Status Checked	2026-09-24	—
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
TDP (W)↓ better	450	—
VRAM (GB)	24	—