Can You Run Gemma 4 on a Mac Studio (128GB)?
Yes — best fit is Gemma 4 31B at BF16 (16-bit) (~58.3GB) ✅ Comfortable, using 123GB of usable memory on a 128GB Mac Studio.
Every Gemma 4 model on this configuration
| Model | Best quant | Size | Status |
|---|---|---|---|
| Gemma 4 E2B | BF16 (16-bit) | ~8 GB | ✅ Comfortable |
| Gemma 4 E4B | BF16 (16-bit) | ~15 GB | ✅ Comfortable |
| Gemma 4 12B | BF16 (16-bit) | ~26.7 GB | ✅ Comfortable |
| Gemma 4 26B A4B | BF16 (16-bit) | ~48 GB | ✅ Comfortable |
| Gemma 4 31B | BF16 (16-bit) | ~58.3 GB | ✅ Comfortable |
How we got this verdict
128 - 5 = 123GB usable (macOS and background processes reserve roughly 5 GB of unified memory).
Because Mac Studio has enough unified memory to spare, 31B fits at BF16 (16-bit)— a higher-precision quant than most setups get. You don't need the 4-bit QAT build here, though it's still a safe download if you want a smaller file for a second model running alongside it.
Try a different configuration
Best fit: Gemma 4 31B · BF16 (16-bit) · ~58.3 GB ✅ Comfortable
FAQ
Can a Mac Studio (128GB) run the 31B flagship model?
Yes, comfortably — Gemma 4 31B fits at BF16 (16-bit) (~58.3GB), using 123GB of usable memory on this configuration.
What's the best Gemma 4 model for a Mac Studio (128GB)?
Gemma 4 31B at BF16 (16-bit) (~58.3GB) is the best fit — it's the largest model that runs comfortably within the 123GB of usable memory here.
What if I have more or less memory than 128GB?
This is the top configuration in this family — every Gemma 4 model already fits at its best available quant. With less (e.g. 96GB), the best-fitting model gets smaller or tighter — see the Mac Studio page.