RTX 4070 meets the minimum VRAM requirement for Q4 inference of openai/gpt-oss-20b. Review the quantization breakdown below to see how higher precision settings impact VRAM and throughput.
RTX 4070 can run openai/gpt-oss-20b with Q4 quantization. At approximately 49 tokens/second, you can expect Moderate speed - useful for batch processing.
VRAM usage will be very close to your GPU's limit. Consider closing other applications or using Q3 quantization for more margin.
| Quantization | VRAM needed | VRAM available | Estimated speed | Verdict |
|---|---|---|---|---|
| Q4 | 10GB | 12GB | 48.77 tok/s | ✅ Fits comfortably |
| Q8 | 20GB | 12GB | 30.20 tok/s | ❌ Not recommended |
| FP16 | 41GB | 12GB | 17.34 tok/s | ❌ Not recommended |