MacBook Pro M4 Pro 24GBコスパ重視
24 GB Unified (+8)
C
This setup is broadly balanced for this model.56 tok/sデコード
〜$1,999 MSRP
Can Qwen3.5 4B run on RX 6900 XT 16GB?
YES — Runs Great
C48Usable
Estimated from fit model
Qwen3.5 4B needs ~5.4 GB VRAM. RX 6900 XT 16GB has 16.0 GB. With Q4_K_M quantization, expect ~56 tok/s.
Runtime: llama.cppCapacity: RoomyBandwidth: MediumStack: StandardBottleneck: Balanced
Operating mode
Choose the run profile you care about
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
Q4_K_M (Medium quality) — 5.4 GB, 56.0 tok/s, Runs well
5.4 GB required16.0 GB available
34% VRAM used
Fit status
Runs well
Decode
56.0 tok/s
TTFT
3457 ms
Safe context
378K
Memory
5.4 GB / 16.0 GB
Memory breakdown
Weights2.4 GB
KV Cache0.5 GB
Runtime0.9 GB
Headroom1.6 GB
See how fast it feels
See how fast it feelsQwen3.5 4B on RX 6900 XT 16GB
1st promptCold start — includes initialization
>What is local AI inference?
Local AI inference means running an AI language model directly on your own hardware — your laptop, desktop, or server — instead of sending requests to a remote cloud API.
When you run inference locally the model weights are loaded into your GPU or unified memory. Each token you generate requires reading those weights from memory, so memory bandwidth is the main bottleneck for decode speed.
Key benefits of running locally:
- Full privacy: your prompts never leave your machine
- No per-token cost or rate limits
- Works offline once the model is downloaded
- Latency depends only on your hardware
2nd promptWarm — model ready, no init overhead
>How much VRAM do I need?
It depends on the model size and quantization level. A rough rule of thumb:
Model size Q4 (4-bit) Q8 (8-bit) FP16
7B params ~4.3 GB ~7.5 GB ~14 GB
13B params ~7.9 GB ~13.9 GB ~26 GB
70B params ~42.7 GB ~74.9 GB ~140 GB
Most people use 4-bit quantization (Q4_K_M) which gives 90-95% of full quality at a fraction of the memory. A 24 GB GPU can comfortably run most 7B-13B models.
Estimated: 56.0 tok/s decode · 3.5s TTFT (warm) · 140 tok/s prefill
What limits this setup
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.
Best improvement path
Performance by workload
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | C | Runs well | 56.0 tok/s | 1886 ms | 378K |
| Coding | C | Runs well | 56.0 tok/s | 3457 ms | 378K |
| Agentic Coding | C | Runs well | 56.0 tok/s | 5029 ms | 378K |
| Reasoning | C | Runs well | 56.0 tok/s | 4086 ms | 378K |
| RAG | C | Runs well | 56.0 tok/s | 6286 ms | 378K |
Quantization options
How Qwen3.5 4B (4B params) fits at each quantization level on RX 6900 XT 16GB (16.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 1.6 GB | Low | C46 |
Q3_K_S | 3 | 2.0 GB | Low | C46 |
NVFP4 | 4 | 2.2 GB | Medium | C47 |
Q4_K_M | 4 | 2.4 GB | Medium | C47 |
Q5_K_M | 5 | 2.9 GB | High | C47 |
Q6_K | 6 | 3.3 GB | High | C48 |
Q8_0 | 8 | 4.3 GB | Very High | C48 |
F16Best for your GPU | 16 | 8.2 GB | Maximum | C52 |
Get started
Copy-paste commands to run Qwen3.5 4B on your machine.
Run
lms load hf-unsloth--qwen3-5-4b-gguf && lms server startアップグレードオプション
Qwen3.5 4Bを快適に動かすハードウェア
Frequently asked questions
Can RX 6900 XT 16GB run Qwen3.5 4B?
Yes, RX 6900 XT 16GB can run Qwen3.5 4B with a C grade (Runs well). Expected decode speed: 56.0 tok/s.
How much VRAM does Qwen3.5 4B need?
Qwen3.5 4B (4B parameters) requires approximately 5.4 GB of memory with Q4_K_M quantization.
What is the best quantization for Qwen3.5 4B?
The recommended quantization for Qwen3.5 4B is Q4_K_M, which balances quality and memory efficiency.
What speed will Qwen3.5 4B run at on RX 6900 XT 16GB?
On RX 6900 XT 16GB, Qwen3.5 4B achieves approximately 56.0 tokens per second decode speed with a time-to-first-token of 3457ms using Q4_K_M quantization.
Can RX 6900 XT 16GB run Qwen3.5 4B for coding?
For coding workloads, Qwen3.5 4B on RX 6900 XT 16GB receives a C grade with 56.0 tok/s and 378K context.
What context window can Qwen3.5 4B use on RX 6900 XT 16GB?
On RX 6900 XT 16GB, Qwen3.5 4B can safely use up to 378K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.
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<iframe src="https://willitrunai.com/embed/hf-unsloth--qwen3-5-4b-gguf-on-rx-6900-xt-16gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>
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