AMD Instinct MI355X vs NVIDIA Rubin CPX
How the AMD Instinct MI355X and NVIDIA Rubin CPX compare across memory, compute, power and form factor, with the stronger figure highlighted on each row. Vendor-specific figures (CUDA vs stream processors, Tensor vs matrix cores) are listed on their own rows.
| Specification | CDNA 4 AMD Instinct MI355X NVIDIA alternative: NVIDIA B200 → |  RUBIN NVIDIA Rubin CPX View Product → |
|---|---|---|
| Pricing | ||
| Price | Not sold by NVNexus | – |
| Overview | ||
| Architecture | AMD CDNA 4 | Rubin (CPX variant) |
| Memory | ||
| Memory | 288 GB HBM3E | HBM4 (capacity per partner configuration) |
| Memory Bandwidth | 8 TB/s | – |
| Memory Interface | 8192-bit | – |
| Compute | ||
| Stream Processors (AMD) | 16,384 (256 CUs) | – |
| Matrix Cores / AI Accelerators (AMD) | 1,024 | – |
| FP32 | 157.3 TFLOPS | – |
| FP64 Tensor | 78.6 TFLOPS | – |
| FP16/BF16 Tensor | 2.5 PFLOPS / 5 (sparse) TFLOPS | – |
| FP8 Tensor | 5 PFLOPS / 10.1 (sparse) TFLOPS | – |
| FP4 Tensor | 10.1 PFLOPS TFLOPS | – |
| Platform | ||
| Interface | PCIe Gen5 x16 | – |
| NVLink / Infinity Fabric | Infinity Fabric, 1,075 GB/s aggregate | NVLink 6, PCIe Gen 6 |
| TDP | 1400W | – |
| Form Factor | OAM module (8-GPU platform) | SXM / rack-integrated |
| Cooling | Liquid cooled | – |
| Transistors | 185 billion | – |
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