Can I Run Gemma 3 on Apple M3 Pro?
Written by Jakub Rusinowski · Last updated September 29, 2026
Yes, but it's tight — Gemma 3 27B Instruct at Q4_K_M needs 25.4 GB at 8K context (16.3 GB weights + 9.1 GB KV cache/overhead), leaving ~1.6 GB of the Apple M3 Pro's 27 GB usable memory, at ~4 tok/s (est.), with room for up to 8K context.
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Apple M3 Pro Specs
| VRAM | 36 GB unified memory |
| Memory Bandwidth | 153 GB/s |
Gemma 3 27B Instruct on the Apple M3 Pro: VRAM by quantization
| Quant | VRAM needed | Fits 36 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 63.1 GB | ✗ No | — | — |
| Q8_0 | 37.8 GB | ✗ No | — | — |
| Q6_K | 31.3 GB | ✗ No | — | — |
| Q5_K_M | 28.3 GB | ✗ No | — | — |
| Q4_K_M | 25.4 GB | ✓ Yes | 8K | — |
| Q3_K_M | 20.6 GB | ✓ Yes | 8K | — |
| Q2_K | 18 GB | ✓ Yes | 16K | — |
Assumes an 8K-token context with an f16 KV cache. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 36 GB of unified memory. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Context costs VRAM too. At Q4_K_M on the Apple M3 Pro: 8K 25.4 GB · 32K 50.4 GB ✗ · 128K 150.2 GB ✗. Past 32K it no longer fits 36 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
No compatible GPU? Gemma 3 27B Instruct on 32 GB of system RAM, CPU only: runs comfortably.
Gemma 3 Sizes That Fit the Apple M3 Pro (at 8K context)
| Gemma 3 27B Instruct | Q4_K_M · 25.4 GB at 8K context · ~4 tok/s (est.) |
| Gemma 3 12B Instruct | Q4_K_M · 11.1 GB at 8K context · ~9 tok/s (est.) |
| Gemma 3 4B Instruct | Q4_K_M · 4.4 GB at 8K context · ~26 tok/s (est.) |
| Gemma 3 1B Instruct | Q4_K_M · 2 GB at 8K context · ~72 tok/s (est.) |
Gemma 3 needs ~25 GB but this GPU has 36 GB. Rent a A100 (40 GB)-class GPU by the hour instead of buying one:
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
FAQ
Is the Apple M3 Pro enough to run Gemma 3 locally?
Yes, but it's tight — Gemma 3 27B Instruct at Q4_K_M needs 25.4 GB at 8K context (16.3 GB weights + 9.1 GB KV cache/overhead), leaving ~1.6 GB of the Apple M3 Pro's 27 GB usable memory, at ~4 tok/s (est.), with room for up to 8K context.
What's the best Gemma 3 size for the Apple M3 Pro?
Gemma 3 27B Instruct at Q4_K_M quantization needs 25.4 GB at 8K context (16.3 GB weights + 9.1 GB KV cache/overhead), estimated ~4 tokens/sec, up to 8K context.
Every Gemma 3 size on the Apple M3 Pro
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Gemma 3 27B Instruct | 25.4 GB | Runs | ~4 tok/s |
| Gemma 3 12B Instruct | 11.1 GB | Runs | ~9 tok/s |
| Gemma 3 4B Instruct | 4.4 GB | Runs | ~26 tok/s |
| Gemma 3 1B Instruct | 2 GB | Runs | ~72 tok/s |
Gemma 3 on Other GPUs
- Gemma 3 on NVIDIA GeForce RTX 5090
- Gemma 3 on Apple M4
- Gemma 3 on Apple M2 Pro
- Gemma 3 on Apple M1 Pro
- Gemma 3 on Apple M5
Popular Models on the Apple M3 Pro
VRAM Tier
Troubleshooting
- Ollama: "model requires more system memory than is available"
- Which GGUF quant should I download? (Q4 vs Q5 vs Q8)
Buying Guide
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