Vicuna 13B needs ~23.0 GB but MacBook Pro M3 Pro 18GB only has 13.0 GB. Try a smaller quantization or lighter model.
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
10.0 GB over capacity — needs offload or smaller quantization
Fit status
Too heavy
Decode
6.7 tok/s
TTFT
28896 ms
Safe context
4K
Memory
23.0 GB / 13.0 GB
Offload
40%
Usable shared or unified memory is the main blocker for this model.
Not enough usable memory
The model needs 23.0 GB, but this setup only exposes 13.0 GB of usable shared or unified memory.
Move to a larger memory pool
A larger unified-memory SKU or a discrete high-bandwidth GPU is the cleanest way to make this model practical.
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | F | Too heavy | 9.5 tok/s | 11097 ms | 4K |
| Coding | F | Too heavy | 6.7 tok/s | 28896 ms | 4K |
| Agentic Coding | F | Too heavy | 6.2 tok/s | 45319 ms | 4K |
| Reasoning | F | Too heavy | 6.7 tok/s | 34150 ms | 4K |
| RAG | F | Too heavy | 6.2 tok/s | 56649 ms | 4K |
How Vicuna 13B (13B params) fits at each quantization level on MacBook Pro M3 Pro 18GB (13.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 5.1 GB | Low | A72 |
Q3_K_S | 3 | 6.4 GB | Low | A73 |
NVFP4 | 4 | 7.3 GB | Medium | A72 |
Q4_K_M | 4 | 7.9 GB | Medium | A72 |
Q5_K_MBest for your GPU | 5 | 9.4 GB | High | A72 |
Q6_K | 6 | 10.7 GB | High | F0 |
Q8_0 | 8 | 13.9 GB | Very High | F0 |
F16 | 16 | 26.7 GB | Maximum | F0 |
アップグレードオプション
Makes the model fit on the accelerator instead of staying completely out of reach.
Raises estimated decode speed by about 28%.
〜$799 MSRP
Makes the model fit on the accelerator instead of staying completely out of reach.
Removes host-memory offload, which is usually the single biggest latency and throughput win.
〜$1,099 MSRP
Makes the model fit on the accelerator instead of staying completely out of reach.
Raises estimated decode speed by about 28%.
〜$1,099 MSRP
RTX 5090 32GB最大の飛躍Makes the model fit on the accelerator instead of staying completely out of reach.
Removes host-memory offload, which is usually the single biggest latency and throughput win.
〜$1,999 MSRP
No, Vicuna 13B requires more memory than MacBook Pro M3 Pro 18GB provides.
Vicuna 13B (13B parameters) requires approximately 23.0 GB of memory with Q4_K_M quantization.
The recommended quantization for Vicuna 13B is Q4_K_M, which balances quality and memory efficiency.
On MacBook Pro M3 Pro 18GB, Vicuna 13B achieves approximately 6.7 tokens per second decode speed with a time-to-first-token of 28896ms using Q4_K_M quantization.
For coding workloads, Vicuna 13B on MacBook Pro M3 Pro 18GB receives a F grade with 6.7 tok/s and 4K context.
On MacBook Pro M3 Pro 18GB, Vicuna 13B can safely use up to 4K tokens of context. The model's official context limit is 4K, but available memory constrains the safe maximum.
Move to a larger memory pool. A larger unified-memory SKU or a discrete high-bandwidth GPU is the cleanest way to make this model practical.
Not always. MacBook Pro M3 Pro 18GB can often fit larger models thanks to unified memory, but a discrete GPU with dedicated high-bandwidth VRAM may still decode faster once the model fits. For this combination, the important distinction is capacity versus sustained throughput.
Paste this snippet into any page to show a live fit card.
<iframe src="https://willitrunai.com/embed/vicuna-13b-on-m3-pro-18gb" 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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