Can MacBook Pro M3 Pro 18 GB run Gemma 3 27B?
18 GB unified · 150 GB/s memory bandwidth · Gemma 3 27B has 27.4B parameters.
Short answer
No. It doesn't fit in memory.
Needs ≈14 GB but only ≈11 GB is available after the OS, other apps and Open WebUI.
Why it doesn’t fit
Even its smallest practical version (3-bit) needs about 14 GB for the model, its context memory and the runtime. After macOS (≈3.5 GB), a browser with a few tabs (≈3.0 GB) and Open WebUI (≈1.0 GB), MacBook Pro M3 Pro 18 GB has about 11 GB left, so it’s 3.1 GB short.
Ways to make it work
Close everything else
Not enough on its own: with every other app closed it’s still about 0.1 GB short.
Pick a smaller model from the same family
No smaller Gemma 3 model in our catalog runs well here. See the other models below.
Get more memory
The same chip with 36 GB handles it: Acceptable.
Check your exact setup
These pages assume typical settings. A shorter context or a lighter chat app can change the answer.
Check MacBook Pro M3 Pro 18 GB
The same applies to every workload we rate (chat, coding questions, coding in a repository, agentic coding and long documents): they all need at least as much memory as chat.
Other models for MacBook Pro M3 Pro 18 GB
The best-rated models for chat on this machine.
- MiniCPM5 2B35–45 tok/sExcellent
- Qwen3.5 4B25–30 tok/sExcellent
- Llama 3.2 3B Instruct30–45 tok/sExcellent
- Qwen3 8B19–25 tok/sExcellent
- Gemma 4 E4B20–30 tok/sExcellent
- DeepSeek-R1-0528-Qwen3-8B19–25 tok/sExcellent
Cheapest machines for Gemma 3 27B
Hardware rated comfortable or better for chat, lowest price first.
- Desktop PC · Intel Arc Pro B60 24GB · 32 GB RAM$1,500 · 10–17 tok/sComfortable
- Desktop PC · Radeon RX 7900 XT · 32 GB RAM$1,550 · 25–40 tok/sExcellent
- Ryzen AI Max+ 395 mini PC / Framework Desktop · 64 GB$1,600 · 12–16 tok/sComfortable
- Desktop PC · Intel Arc Pro B60 24GB · 64 GB RAM$1,628 · 10–17 tok/sComfortable
- Desktop PC · GeForce RTX 3090 · 32 GB RAM$1,700 · 25–35 tok/sExcellent
- Mac mini M4 Pro 48 GB$1,799 · 11–15 tok/sComfortable
Same chip, other memory: 36 GB
Different tool, context size or workload?
These pages use typical settings. The full check models your exact setup.