RTX 4090 meets the minimum VRAM requirement for Q4 inference of Qwen/Qwen3-4B-Thinking-2507-FP8. Review the quantization breakdown below to see how higher precision settings impact VRAM and throughput.
RTX 4090 can run Qwen/Qwen3-4B-Thinking-2507-FP8 with Q4 quantization. At approximately 195 tokens/second, you can expect Excellent speed - conversational response times under 1 second.
You have 22GB headroom, which is sufficient for system overhead and smooth operation.
| Quantization | VRAM needed | VRAM available | Estimated speed | Verdict |
|---|---|---|---|---|
| Q4 | 2GB | 24GB | 195.41 tok/s | ✅ Fits comfortably |
| Q8 | 4GB | 24GB | 119.70 tok/s | ✅ Fits comfortably |
| FP16 | 9GB | 24GB | 75.21 tok/s | ✅ Fits comfortably |