Can I Run Qwen 3.5 4B on Apple M1 Ultra?
Written by Jakub Rusinowski · Last updated July 12, 2026
Yes. Qwen 3.5 4B needs 3.5 GB at 8K context (2.4 GB weights + 1.1 GB KV cache/overhead) at Q4_K_M and the Apple M1 Ultra has 96 GB usable, leaving about 92.5 GB of headroom, at roughly 113 tok/s (estimated) with room for up to 32K of context.
See what else this hardware can run →
The numbers
| Model | Qwen 3.5 4B |
| Parameters | 4B |
| Quantization | Q4_K_M |
| VRAM needed (8K context) | 3.5 GB |
| Apple M1 Ultra usable memory | 96 GB |
| Verdict | Runs |
| Max context | 32K |
| Estimated speed | ~113 tok/s |
Qwen 3.5 4B on the Apple M1 Ultra: VRAM by quantization
| Quant | VRAM needed | Fits 128 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 9.1 GB | ✓ Yes | 32K | — |
| Q8_0 | 5.3 GB | ✓ Yes | 32K | — |
| Q6_K | 4.3 GB | ✓ Yes | 32K | — |
| Q5_K_M | 3.9 GB | ✓ Yes | 32K | — |
| Q4_K_M | 3.5 GB | ✓ Yes | 32K | — |
| Q3_K_M | 2.8 GB | ✓ Yes | 32K | — |
| Q2_K | 2.4 GB | ✓ Yes | 32K | — |
Assumes an 8K-token context with an f16 KV cache. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 128 GB of unified memory. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Context costs VRAM too. At Q4_K_M on the Apple M1 Ultra: 8K 3.5 GB · 32K 4.3 GB. Every window this model publishes still fits 128 GB.
What to do next
Nothing to change — run it at Q4_K_M. If you want more capability, check whether the next size up also fits.
No compatible GPU? Qwen 3.5 4B on 8 GB of system RAM, CPU only: runs.
Running Qwen 3.5 4B on this card:
Qwen 3.5 4B needs ~4 GB but this GPU has 128 GB. Rent a RTX 4090 (24 GB)-class GPU by the hour instead of buying one:
Affiliate links — we may earn a commission if you sign up, at no extra cost to you.
Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
Other Qwen 3.5 sizes on the Apple M1 Ultra
- Qwen 3.5 397B-A17B — does not fit (139 GB)
- Qwen 3.5 122B-A10B — runs (77.3 GB)
- Qwen 3.5 35B-A3B — runs (23.8 GB)
- Qwen 3.5 27B — runs (18.8 GB)
- Qwen 3.5 9B — runs (6.5 GB)
- Qwen 3.5 2B — runs (2.7 GB)
- Qwen 3.5 0.8B — runs (1.8 GB)
Qwen 3.5 4B on nearby hardware
- NVIDIA RTX PRO 6000 Blackwell (96 GB) — runs
- Apple M2 Ultra (192 GB) — runs
All Qwen 3.5 sizes on the Apple M1 Ultra | Qwen 3.5 4B model page | Apple M1 Ultra GPU page | VRAM calculator | Check your hardware