AMD Instinct MI250X meets the minimum VRAM requirement for Q4 inference of stepfun-ai/Step-3.5-Flash. Review the quantization breakdown below to see how higher precision settings impact VRAM and throughput.
AMD Instinct MI250X can run stepfun-ai/Step-3.5-Flash with Q4 quantization. At approximately 53 tokens/second, you can expect Good speed - acceptable for interactive use.
You have 16GB headroom, which is sufficient for system overhead and smooth operation.
| Quantization | VRAM needed | VRAM available | Estimated speed | Verdict |
|---|---|---|---|---|
| Q4 | 112GB | 128GB | 52.98 tok/s | ✅ Fits comfortably |
| Q8 | 223GB | 128GB | 37.91 tok/s | ❌ Not recommended |
| FP16 | 446GB | 128GB | 20.37 tok/s | ❌ Not recommended |