Can I run it?
Can I run granite 4.2 3b on Apple M4 Max (40-core GPU)?
Runs great
Runs great fully in unified memory on your Apple M4 Max (40-core GPU) at BF16, 8K context, about 38–51 tok/s. Weights 6.82 GB plus 0.63 GB of KV cache — 7.81 GB of 36.0 GB usable. Up to 128K context still fits.
Best quantBF16
Working context8K
Max that fits128K
Speed38–51 tok/s
Weights6.82 GB
KV cache0.63 GB
Total7.81 GB
Usable36.0 GB
granite 4.2 3b details · Apple M4 Max (40-core GPU) page · How this estimate is made
Run commands
llama.cpp
llama-server -hf ibm-granite/granite-4.2-3b-GGUF:BF16 -c 8192 -ngl 40
No matching name in the Ollama library snapshot.
LM Studio
lms get ibm-granite/granite-4.2-3b-GGUF # Then load quant BF16
Assumptions
- Estimate, not a benchmark. Decode speed uses a memory-bandwidth model at 55–75% of peak.
- KV cache is FP16. Engine overhead assumes llama.cpp (0.3 GB + 1% of the weights). Ollama is closer to 0.9 GB + 3%, LM Studio closer to 1 GB + 3%.
- BF16 size is the real GGUF file size from Hugging Face.
- Unified memory uses 75% for the GPU by default, and always leaves about 5 GB for the OS.
- Speed is quoted at 8K context, not at the maximum context that still fits.
Larger models that also fit
- Can I run Qwen3.8 27B on Apple M4 Max (40-core GPU)? — Runs, UD-Q8_K_L, 11–14 tok/s
- Can I run gemma 4 12b it on Apple M4 Max (40-core GPU)? — Runs, BF16, 11–15 tok/s
- Can I run Qwen3.5 9B on Apple M4 Max (40-core GPU)? — Runs great, BF16, 17–23 tok/s
Updated 2026-10-24. Profile on this page is the device default.