Yes — with 39.7 GB to spare
Gemma 3 12B at Q4_K_M fits your M4 Pro · 64 GB entirely in unified memory at 8K context, at an estimated 22 tokens per second. There is room for its full 128K window.
Fully in unified memory
8K context
Q4_K_M · 6.9 GB
Gemma Terms of Use
Released Mar 2025
Vision
Strong multilingual chat with images, sized for 12–16 GB cards. Gemma 4 12B is the same size and better.
The VRAM budget
weights 6.9 GB
Weights 6.9 GB
KV cache @ 8K 0.81 GB
Runtime overhead 0.6 GB
Free 39.7 GB of 48.0 GB
Quantisation ladder
| Quant | Weights | Total @ 8K | Max context | Tok/s | Quality | Fit |
|---|---|---|---|---|---|---|
| F16 | 22.7 GB | 24.1 GB | 128K | 6.7 | Reference | Long context |
| Q8_0 | 12.1 GB | 13.5 GB | 128K | 13 | −0.1% ppl | Long context |
| Q6_K | 9.3 GB | 10.7 GB | 128K | 16 | −0.4% ppl | Long context |
| Q5_K_M | 8.1 GB | 9.5 GB | 128K | 19 | −0.8% ppl | Long context |
| Q4_K_M | 6.9 GB | 8.3 GB | 128K | 22 | −1.9% ppl | Recommended |
| Q3_K_M | 5.6 GB | 7.0 GB | 128K | 27 | −5.4% ppl | Long context |
| Q2_K | 4.8 GB | 6.2 GB | 128K | 32 | −15% ppl | Long context |
Quality is the published perplexity delta against f16 weights. Max context assumes an f16 KV cache; q8_0 roughly doubles it. This model interleaves sliding-window layers (1024 tokens, 1 global in 6), which is why its cache barely grows with context.
How to run it
$ pip install mlx-lm $ mlx_lm.generate --model mlx-community/gemma-3-12b-it-4bit \ --max-tokens 512 --prompt "Hello"
Apple's own array framework. The fastest path on Apple Silicon. More on MLX.
01Download is 6.9 GB. Keep it on an SSD — a first load off a spinning disk takes minutes.
02macOS caps what the GPU may wire down at about 48.0 GB of 64 GB. Raising it with iogpu.wired_limit_mb is possible, and risky.
03There is room to go to the model's full 128K context on this card.