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

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

Rig A

NVIDIA · workstation

Change

Rig B

AMD · accelerator

Change

0 of 45 fields comparable

Spec	NVIDIA DGX Spark	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)
CPU Breakdown	10x Arm Cortex-X925 + 10x Arm Cortex-A725	—
CPU Cores Total	20	—
Dimensions MM	150 x 150 x 50.5	—
Ethernet	1x 10 GbE RJ-45	—
Form factor	—	OAM
Fp16 Matrix Pflops Dense	—	2.5
Fp16 Matrix Pflops Sparse	—	5
Fp32 Vector Tflops	—	157.3
FP4 Pflops Sparse	1	—
Fp64 Matrix Tflops	—	78.6
FP8 Matrix Pflops Dense	—	5
FP8 Matrix Pflops Sparse	—	10.1
Gb10 TDP Watts	140	—
GPU Arch	Blackwell, 5th-gen Tensor Cores, 4th-gen RT Cores	—
HBM (GB)	—	288
HBM Type	—	HBM3E
Helios Gpus PER Rack	—	72
Launch Price USD	3,999	—
Memory bandwidth (GB/s)	273	—
Memory bandwidth (TB/s)	—	8
Memory Interface BIT	256	—
Memory type	LPDDR5X	—
MSRP (USD)↓ better	4,699	—
Mxfp4 Matrix Pflops	—	10.1
Mxfp6 Matrix Pflops	—	10.1
NIC	ConnectX-7 @ 200 Gbps	—
Pcie GEN	—	5
Price Change Effective	2026-02-23	—
Process Node NM	—	3
PSU Watts	240	—
Storage	4TB NVMe M.2 self-encrypting	—
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
Superchip	NVIDIA GB10 Grace Blackwell	—
TBP Watts	—	1,400
Unified Memory GB	128	—
Weight KG	1.2	—
Wireless	Wi-Fi 7, Bluetooth 5.4	—