Can the RTX 4090 run Qwen3.5 9B?
Yes. Qwen3.5 9B fits the RTX 4090's 24 GB at Q4_K_M (about 7.8 GB needed), running at an estimated 104 tok/s. There's room for up to FP16 if you want higher quality.
Every quantization
Qwen3.5 9B (9.7B) on 24 GB
| Quant | Weights | Needs | Fit | Est. speed |
|---|---|---|---|---|
| Q4_K_M | 6 GB | 7.8 GB | Fits easily | ~104 tok/s |
| Q5_K_M | 7 GB | 8.8 GB | Fits easily | ~89 tok/s |
| Q8_0 | 10 GB | 11.8 GB | Fits easily | ~63 tok/s |
| FP16 | 19 GB | 20.8 GB | Tight | ~33 tok/s |
Estimates. Needs = weights + 1.8 GB for KV cache and runtime at modest context. Speed is single-stream decode scaled from the RTX 4090's 1008 GB/s bandwidth (XiongjieDai/GPU-Benchmarks-on-LLM-Inference). Long contexts need more memory and run slower.
Run it
Copy, paste, go
llama-server -hf unsloth/Qwen3.5-9B-GGUF -ngl 99Ollama pulls a Q4 build by default. Pick a larger quant only if the table above says it fits. Full Qwen3.5 9B details →
Compare
Same model, other hardware - and other models on this card
Qwen3.5 9B on other hardware
- RTX 5090~171 tok/s
- RTX 5090 D~171 tok/s
- RTX 6000D~150 tok/s
- Radeon RX 7900 XTX~92 tok/s
- RTX 5080~92 tok/s
- RTX 3090~91 tok/s
- RTX 3080 Ti~87 tok/s
- RTX 5080 Mobile~86 tok/s
Also runs on the RTX 4090
- GLM-4.7-Flash~241 tok/s
- Qwen3-30B-A3B-Instruct-2507~236 tok/s
- Qwen3.6 27B~39 tok/s
- Qwen3.8 27B~39 tok/s
- Gemma 4 26B A4B~184 tok/s
- gpt-oss-20b~208 tok/s
- Qwen2.5-Coder-14B-Instruct~70 tok/s
- Qwen3 14B~78 tok/s
Frequently asked
Quick answers
Can the NVIDIA RTX 4090 run Qwen3.5 9B?
Yes. Qwen3.5 9B fits the RTX 4090's 24 GB at Q4_K_M (about 7.8 GB needed), running at an estimated 104 tok/s. There's room for up to FP16 if you want higher quality.
How much VRAM does Qwen3.5 9B need?
About 6 GB of weights at Q4_K_M, 10 GB at Q8_0 and 19 GB at FP16. Add roughly 1.8 GB for the KV cache and runtime at modest context lengths.
How fast is Qwen3.5 9B on the RTX 4090?
Roughly 104 tokens per second at Q4_K_M (single user, llama.cpp-style decode). This is an estimate from the RTX 4090's 1008 GB/s memory bandwidth.