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

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

Rig A

SambaNova · accelerator

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Rig B

AMD · accelerator

Change

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Spec	SambaNova SN40L Reconfigurable Dataflow Unit	AMD Instinct MI355X
Bf16 Matrix Pflops Dense	—	2.5
Bf16 Matrix Pflops Sparse	—	5
Bf16 Tflops PER Socket	638	—
Compute Units	—	256
Cooling	—	direct liquid cooling (air-cooled option available)
Current Family Listed	SN50, SN40	—
DDR Bandwidth GB S	200	—
Ddr5 Capacity TB	1.5	—
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 Bandwidth TB S	1.8	—
HBM Type	—	HBM3E
Hbm3 Capacity GB	64	—
Helios Gpus PER Rack	—	72
Memory bandwidth (TB/s)	—	8
Mxfp4 Matrix Pflops	—	10.1
Mxfp6 Matrix Pflops	—	10.1
ON Chip Sram MB	520	—
Packaging	3x CoWoS-S, 2 accelerator dies	—
Pattern Compute Units	1,040	—
Pcie GEN	—	5
Process Node	TSMC 5nm	—
Process Node NM	—	3
Status Checked	2026-09-24	—
Successor	SN50 (fifth-generation RDU)	—
Successor Cdna Version	—	5
Successor Family	—	AMD Instinct MI400 Series (MI455X)
Successor Introduced	2026-02-24	—
Successor Launch	—	2026-07-23
Successor Mi455x Bandwidth TB S	—	23.3
Successor Mi455x Hbm4 GB	—	432
TBP Watts	—	1,400