AMD Instinct MI300X vs NVIDIA Rubin CPX
How the AMD Instinct MI300X 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 3 AMD Instinct MI300X NVIDIA alternative: NVIDIA H100 SXM → |  RUBIN NVIDIA Rubin CPX View Product → |
|---|---|---|
| Pricing | ||
| Price | Not sold by NVNexus | – |
| Overview | ||
| Architecture | AMD CDNA 3 | Rubin (CPX variant) |
| Memory | ||
| Memory | 192 GB HBM3 | HBM4 (capacity per partner configuration) |
| Memory Bandwidth | 5.3 TB/s | – |
| Memory Interface | 8192-bit | – |
| Compute | ||
| Stream Processors (AMD) | 19,456 (304 CUs) | – |
| Matrix Cores / AI Accelerators (AMD) | 1,216 | – |
| FP32 | 163.4 TFLOPS (matrix) | – |
| FP64 Tensor | 163.4 TFLOPS (matrix) | – |
| TF32 Tensor | 653.7 TFLOPS / 1,307 (sparse) | – |
| FP16/BF16 Tensor | 1,307 TFLOPS / 2,615 (sparse) | – |
| FP8 Tensor | 2,615 TFLOPS / 5,230 (sparse) | – |
| INT8 Tensor | 2,615 TOPS / 5,230 (sparse) | – |
| Platform | ||
| Interface | PCIe Gen5 x16 | – |
| NVLink / Infinity Fabric | Infinity Fabric, 896 GB/s aggregate | NVLink 6, PCIe Gen 6 |
| TDP | 750W | – |
| Form Factor | OAM module (8-GPU platform) | SXM / rack-integrated |
| Cooling | Passive (chassis airflow) | – |
| Transistors | 153 billion | – |
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