WizardLM 13B needs ~27.9 GB VRAM. Mac Studio M2 Ultra 64GB has 46.1 GB. With Q4_K_M quantization, expect ~59 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
58.5 tok/s
TTFT
3309 ms
Safe context
8K
Memory
27.9 GB / 46.1 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 | A | Runs well | 58.5 tok/s | 1805 ms | 8K |
| Coding | A | Runs well | 58.5 tok/s | 3309 ms | 8K |
| Agentic Coding | A | Tight fit | 58.5 tok/s | 4813 ms | 8K |
| Reasoning | A | Runs well | 58.5 tok/s | 3910 ms | 8K |
| RAG | A | Tight fit | 58.5 tok/s | 6016 ms | 8K |
How WizardLM 13B (13B params) fits at each quantization level on Mac Studio M2 Ultra 64GB (46.1 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 5.1 GB | Low | B63 |
Q3_K_S | 3 | 6.4 GB | Low | B63 |
NVFP4 | 4 |
Copy-paste commands to run WizardLM 13B on your machine.
Run
lms load WizardLM-13B-V1.0 && lms server startYour hardware
| Model | Params | Grade | Decode | Capabilities |
|---|---|---|---|---|
 Qwen3-Coder 30B A3B Instruct | 30.5B | S | 70.2 tok/s | |
| Qwen 3.5 27B | 27B | S | 30.4 tok/s |
Yes, Mac Studio M2 Ultra 64GB can run WizardLM 13B with a A grade (Runs well). Expected decode speed: 58.5 tok/s.
WizardLM 13B (13B parameters) requires approximately 27.9 GB of memory with Q4_K_M quantization.
The recommended quantization for WizardLM 13B is Q4_K_M, which balances quality and memory efficiency.
On Mac Studio M2 Ultra 64GB, WizardLM 13B achieves approximately 58.5 tokens per second decode speed with a time-to-first-token of 3309ms using Q4_K_M quantization.
For coding workloads, WizardLM 13B on Mac Studio M2 Ultra 64GB receives a A grade with 58.5 tok/s and 8K context.
On Mac Studio M2 Ultra 64GB, WizardLM 13B can safely use up to 8K tokens of context. The model's official context limit is 8K, 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/wizardlm-13b-on-m2-ultra-64gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>
Preview:
7.3 GB |
| Medium |
| B63 |
Q4_K_M | 4 | 7.9 GB | Medium | B63 |
Q5_K_M | 5 | 9.4 GB | High | B64 |
Q6_K | 6 | 10.7 GB | High | B64 |
Q8_0 | 8 | 13.9 GB | Very High | B65 |
F16Best for your GPU | 16 | 26.7 GB | Maximum | B69 |
| Qwen 3.6 27B | 27B | S | 23.1 tok/s |
| Qwen 3.6 35B A3B | 35B | S | 59 tok/s |
| Qwen3-VL 30B A3B Instruct | 30B | S | 72.6 tok/s |
Not always. Mac Studio M2 Ultra 64GB 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.