Magistral Small 2507 needs ~45.6 GB VRAM. Mac Studio M3 Ultra 256GB has 184.3 GB. With Q4_K_M quantization, expect ~41 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
40.9 tok/s
TTFT
4734 ms
Safe context
131K
Memory
45.6 GB / 184.3 GB
This setup is broadly balanced for this model.
Shared-memory contention still exists
The OS, browser, and inference runtime all compete for the same physical memory pool, so real-world headroom is less forgiving than raw capacity suggests.
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | S | Runs well | 40.9 tok/s | 2582 ms | 131K |
| Coding | S | Runs well | 40.9 tok/s | 4734 ms | 131K |
| Agentic Coding | S | Runs well | 40.9 tok/s | 6886 ms | 131K |
| Reasoning | S | Runs well | 40.9 tok/s | 5595 ms | 131K |
| RAG | S | Runs well | 40.9 tok/s | 8608 ms | 131K |
How Magistral Small 2507 (24B params) fits at each quantization level on Mac Studio M3 Ultra 256GB (184.3 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 9.4 GB | Low | A79 |
Q3_K_S | 3 | 11.8 GB | Low | A79 |
NVFP4 | 4 |
Copy-paste commands to run Magistral Small 2507 on your machine.
Run
ollama run magistralYour hardware
| Model | Params | Grade | Decode | Capabilities |
|---|---|---|---|---|
 Devstral 2 123B Instruct | 123B | S | 8.1 tok/s | |
 Qwen3-Coder 30B A3B Instruct | 30.5B | S |
Yes, Mac Studio M3 Ultra 256GB can run Magistral Small 2507 with a S grade (Runs well). Expected decode speed: 40.9 tok/s.
Magistral Small 2507 (24B parameters) requires approximately 45.6 GB of memory with Q4_K_M quantization.
The recommended quantization for Magistral Small 2507 is Q4_K_M, which balances quality and memory efficiency.
On Mac Studio M3 Ultra 256GB, Magistral Small 2507 achieves approximately 40.9 tokens per second decode speed with a time-to-first-token of 4734ms using Q4_K_M quantization.
For coding workloads, Magistral Small 2507 on Mac Studio M3 Ultra 256GB receives a S grade with 40.9 tok/s and 131K context.
On Mac Studio M3 Ultra 256GB, Magistral Small 2507 can safely use up to 131K tokens of context. The model's official context limit is 131K, 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/magistral-small-2507-on-m3-ultra-256gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>
Preview:
13.4 GB |
| Medium |
| A79 |
Q4_K_M | 4 | 14.6 GB | Medium | A79 |
Q5_K_M | 5 | 17.3 GB | High | A79 |
Q6_K | 6 | 19.7 GB | High | A79 |
Q8_0 | 8 | 25.7 GB | Very High | A80 |
F16Best for your GPU | 16 | 49.2 GB | Maximum | A82 |
| 84.2 tok/s |
| Qwen 3.5 27B | 27B | S | 36.5 tok/s |
| Qwen 3.6 27B | 27B | S | 27.8 tok/s |
| Qwen 3.5 122B A10B | 122B | S | 34.7 tok/s |
Not always. Mac Studio M3 Ultra 256GB 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.