RTX 4090 meets the minimum VRAM requirement for Q4 inference of lmsys/vicuna-7b-v1.5. Review the quantization breakdown below to see how higher precision settings impact VRAM and throughput.
RTX 4090 can run lmsys/vicuna-7b-v1.5 with Q4 quantization. At approximately 167 tokens/second, you can expect Excellent speed - conversational response times under 1 second.
You have 20GB headroom, which is sufficient for system overhead and smooth operation.
| Quantization | VRAM needed | VRAM available | Estimated speed | Verdict |
|---|---|---|---|---|
| Q4 | 4GB | 24GB | 167.05 tok/s | ✅ Fits comfortably |
| Q8 | 7GB | 24GB | 113.62 tok/s | ✅ Fits comfortably |
| FP16 | 15GB | 24GB | 65.61 tok/s | ✅ Fits comfortably |