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Can I run Olmo 3.1 32B Instruct on Apple M4 (16GB)?

Compatibility verdict VRAM threshold engine
No, not enough memory would not load

No. Olmo 3.1 32B Instruct needs ~20.3 GB even at Q4_K_M, but Apple M4 (16GB) only has ~10.5 GB usable.

Needs ~20.3 GB Device usable ~10.5 GB

Needs ~20.3 GB even at Q4_K_M, but only ~10.5 GB is usable.

That figure is at a 4k context and moves about ±15% as context length changes.

The gap is about 9.8 GB: Olmo 3.1 32B Instruct needs roughly 20.3 GB at Q4_K_M and Apple M4 (16GB) leaves only about 10.5 GB usable for a model. The lightest tracked hardware that runs Olmo 3.1 32B Instruct is the Nvidia GeForce RTX 4090 (24GB) at 24 GB. See Olmo 3.1 32B Instruct on Nvidia GeForce RTX 4090 (24GB).

Q4_K_M needed
~20.3 GB
Usable on device
~10.5 GB
Device memory
16 GB
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Which quant fits

Quant ladder vs ~10.5 GB usable
Q2_K
~15.6 GB
Q3_K_M
~17.8 GB
Q4_K_M
~20.3 GB
Q5_K_M
~25 GB
Q6_K
~28.4 GB
Q8_0
~34.1 GB
FP16
~66.2 GB
The line marks Apple M4 (16GB)'s ~10.5 GB budget; rungs past it are too large.
Model Olmo
Parameters
32B
Q4_K_M size
18.14 GB
Q8_0 size
31.9 GB
Context
64k
Ollama tag
olmo-3.1:32b-instruct
Full Olmo 3.1 32B Instruct requirements →
Device macOS
Memory
16 GB unified
Usable for weights
~10.5 GB
Power draw
~65 W
Best runtime
Ollama (MLX backend, preview) / MLX direct
Best models for Apple M4 (16GB) →

What you can run instead

Run Olmo 3.1 32B Instruct on other hardware

FAQ

Can Apple M4 (16GB) run Olmo 3.1 32B Instruct?

No. Olmo 3.1 32B Instruct needs ~20.3 GB even at Q4_K_M, but Apple M4 (16GB) only has ~10.5 GB usable.

How much memory does Olmo 3.1 32B Instruct need?

Apple M4 (16GB) does not have enough memory. At Q4_K_M the weights are ~18.14 GB; with KV cache and runtime overhead, budget ~20.3 GB at a 4k context.

What is the best tool to run Olmo 3.1 32B Instruct on macOS?

LM Studio for a simple setup; mlx-lm for the most speed. vLLM is NOT a Mac tool, it is a CUDA/Linux serving engine. Unified memory is not a fixed VRAM slice; ~70% is usable for weights.

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Sources

Weights are measured from GGUF files; KV cache and overhead are computed, so totals can vary ~15% with context and runtime. Any tok/s is a bandwidth estimate. See methodology.