GPUFits
Can Mac Studio M3 Ultra (96GB) run Llama 3.3 70B?
✅ Comfortable
Llama 3.3 70B @ Q4_K_M · 8K context
Needed
47.4 GB
Usable
72.0 GB
VRAM breakdown
| Weights (Q4_K_M) | 43.2 GB |
| KV cache (8K context) | 2.7 GB |
| Runtime overhead | 1.5 GB |
| Total | 47.4 GB |
Computed at 8K context with fp16 KV cache. Longer contexts need more VRAM — use the VRAM calculator for other settings.
Recommended quantization
Q6_K
Estimated generation speed
~11 tok/s @ Q6_K
Theoretical estimates based on published architecture data and measured GGUF sizes; real-world speed varies ±30%.
Smaller models this GPU runs well
FAQ
- How much VRAM does Llama 3.3 70B need?
- At Q4_K_M with 8K context: 43.2GB weights + 2.7GB KV cache + 1.5GB runtime overhead = 47.4GB total. Mac Studio M3 Ultra (96GB) offers 72.0GB usable VRAM, so the verdict is: Comfortable.
- What is the best quantization for Llama 3.3 70B on Mac Studio M3 Ultra (96GB)?
- Q6_K — the highest tier that still fits within 72.0GB usable VRAM at 8K context. Lower tiers (Q3/Q2) fit too but cost noticeable quality.
- How fast does Llama 3.3 70B run on Mac Studio M3 Ultra (96GB)?
- About 11 tokens/s at Q6_K (theoretical estimate, ±30% in real-world use).
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Data verified 2026-08-04