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MCS · Rigs · Compare

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

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

Rig A

Alibaba Qwen2.5-72B-Instruct (Q4 quant)

Alibaba · cloud-model

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Rig B

AMD Instinct MI355X

AMD · accelerator

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SpecAlibaba Qwen2.5-72B-Instruct (Q4 quant)AMD Instinct MI355X
Bf16 Matrix Pflops Dense—2.5
Bf16 Matrix Pflops Sparse—5
Compute Units—256
Context Window Tokens K128—
Cooling—direct liquid cooling (air-cooled option available)
Dual Card Count2—
Dual Card Vram GB24—
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
GPT Version5—
HBM (GB)—288
HBM Type—HBM3E
Helios Gpus PER Rack—72
Memory bandwidth (TB/s)—8
Mxfp4 Matrix Pflops—10.1
Mxfp6 Matrix Pflops—10.1
Parameter Count B72—
Pcie GEN—5
Process Node NM—3
Qwen Version3—
Qwen25 72B InstructQwen2.5-72B-Instruct—
Qwen25 Version2.5—
Qwen3 Largest Dense Checkpoint B32—
RTX 5090 Pairing Vram GB32—
Status Checked2026-09-24—
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
Vram Required GB44—