Can I Run Granite 4.1 8B on Apple M5 Pro?
Written by Jakub Rusinowski · Last updated July 12, 2026
Yes. Granite 4.1 8B needs 6.8 GB at 8K context (4.8 GB weights + 2 GB KV cache/overhead) at Q4_K_M and the Apple M5 Pro has 48 GB usable, leaving about 41.2 GB of headroom, at roughly 28 tok/s (estimated) with room for up to 128K of context.
See what else this hardware can run →
The numbers
| Model | Granite 4.1 8B |
| Parameters | 8B |
| Quantization | Q4_K_M |
| VRAM needed (8K context) | 6.8 GB |
| Apple M5 Pro usable memory | 48 GB |
| Verdict | Runs |
| Max context | 128K |
| Estimated speed | ~28 tok/s |
Granite 4.1 8B on the Apple M5 Pro: VRAM by quantization
| Quant | VRAM needed | Fits 64 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 17.9 GB | ✓ Yes | 128K | — |
| Q8_0 | 10.4 GB | ✓ Yes | 128K | — |
| Q6_K | 8.5 GB | ✓ Yes | 128K | — |
| Q5_K_M | 7.6 GB | ✓ Yes | 128K | — |
| Q4_K_M | 6.8 GB | ✓ Yes | 128K | — |
| Q3_K_M | 5.4 GB | ✓ Yes | 128K | — |
| Q2_K | 4.6 GB | ✓ Yes | 128K | — |
Assumes an 8K-token context with an f16 KV cache, on an estimated architecture — this model publishes no config we can read. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 64 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 M5 Pro: 8K 6.8 GB · 32K 10.2 GB · 128K 23.9 GB. Every window this model publishes still fits 64 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? Granite 4.1 8B on 16 GB of system RAM, CPU only: runs.
Running Granite 4.1 8B on this card:
Granite 4.1 8B needs ~7 GB but this GPU has 64 GB. Rent a RTX 4090 (24 GB)-class GPU by the hour instead of buying one:
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
Other IBM Granite 4.1 sizes on the Apple M5 Pro
- Granite 4.1 30B — runs (33.5 GB)
- Granite 4.1 3B — runs (3.5 GB)
Granite 4.1 8B on nearby hardware
- NVIDIA L40S (48 GB) — runs
- Apple M3 Max (128 GB) — runs
All IBM Granite 4.1 sizes on the Apple M5 Pro | Granite 4.1 8B model page | Apple M5 Pro GPU page | VRAM calculator | Check your hardware