Qwen 3 4B needs ~10.3 GB VRAM. NVIDIA L40S 48GB has 48.0 GB. With Q4_K_M quantization, expect ~60 tok/s.
Operating mode
Interactive favors responsiveness, while light API and scale-out lean harder on serving readiness. The fit stays the same, but the recommendation lens changes.
Current mode
Balanced
Balanced for general local use. Keeps the ranking neutral across personal and serving workflows.
Select quantization to explore
Fit status
Runs well
Decode
60.0 tok/s
TTFT
3227 ms
Safe context
33K
Memory
10.3 GB / 48.0 GB
This setup is broadly balanced for this model.
No major red flags
This recommendation has enough memory headroom and acceptable estimated speed for the selected workload.
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | A | Runs well | 60.0 tok/s | 1760 ms | 33K |
| Coding | A | Runs well | 60.0 tok/s | 3227 ms | 33K |
| Agentic Coding | A | Runs well | 60.0 tok/s | 4693 ms | 33K |
| Reasoning | A | Runs well | 60.0 tok/s | 3813 ms | 33K |
| RAG | A | Runs well | 60.0 tok/s | 5867 ms | 33K |
How Qwen 3 4B (4B params) fits at each quantization level on NVIDIA L40S 48GB (48.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 1.6 GB | Low | A73 |
Q3_K_S | 3 | 2.0 GB | Low | A73 |
NVFP4 | 4 |
Copy-paste commands to run Qwen 3 4B on your machine.
Run
ollama run qwen3:4bYour hardware
| Model | Params | Grade | Decode | Capabilities |
|---|---|---|---|---|
| 30.5B | S | 73.4 tok/s | ||
| 27B | S | 30.6 tok/s |
Yes, NVIDIA L40S 48GB can run Qwen 3 4B with a A grade (Runs well). Expected decode speed: 60.0 tok/s.
Qwen 3 4B (4B parameters) requires approximately 10.3 GB of memory with Q4_K_M quantization.
The recommended quantization for Qwen 3 4B is Q4_K_M, which balances quality and memory efficiency.
On NVIDIA L40S 48GB, Qwen 3 4B achieves approximately 60.0 tokens per second decode speed with a time-to-first-token of 3227ms using Q4_K_M quantization.
For coding workloads, Qwen 3 4B on NVIDIA L40S 48GB receives a A grade with 60.0 tok/s and 33K context.
On NVIDIA L40S 48GB, Qwen 3 4B can safely use up to 33K tokens of context. The model's official context limit is 33K, but available memory constrains the safe maximum.
Paste this snippet into any page to show a live fit card.
<iframe src="https://willitrunai.com/embed/qwen-3-4b-on-l40s-48gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>
Preview:
2.2 GB |
| Medium |
| A73 |
Q4_K_M | 4 | 2.4 GB | Medium | A73 |
Q5_K_M | 5 | 2.9 GB | High | A73 |
Q6_K | 6 | 3.3 GB | High | A73 |
Q8_0 | 8 | 4.3 GB | Very High | A73 |
F16Best for your GPU | 16 | 8.2 GB | Maximum | A74 |
| 27B | S | 20.1 tok/s |
| 35B | S | 91.6 tok/s |
| 30B | S | 105.4 tok/s |