# Can I run Gemma 3 27B on Apple M3 Ultra (256GB)?

Updated: 2026-06-15

**Yes, it runs.** Runs at Q4_K_M using ~18.6 GB of ~192 GB usable. You have room for FP16 for higher quality.

- Model: 27B, Q4_K_M 16.55 GB
- Device: 256 GB unified, ~192 GB usable for weights
- Needs ~18.6 GB at Q4_K_M; recommended quant: Q4_K_M
- Best tool on macOS: LM Studio
- Command: `ollama run gemma3:27b`

Estimate. Method: weights + KV cache + ~0.8GB overhead. Sources: https://ollama.com/library/gemma3, https://ollama.com/library/gemma3/tags, https://huggingface.co/bartowski/google_gemma-3-27b-it-GGUF, https://lmarena.ai/leaderboard.

More: https://localmodel.run/can-i-run/gemma-3-27b/apple-m3-ultra-256gb