Can gemma 3 27b it run on MacBook Pro M3 Max 48GB?

Q: Is unified memory on MacBook Pro M3 Max 48GB as fast as VRAM for gemma 3 27b it?

Not always. MacBook Pro M3 Max 48GB can often fit larger models thanks to unified memory, but a discrete GPU with dedicated high-bandwidth VRAM may still decode faster once the model fits. For this combination, the important distinction is capacity versus sustained throughput.

YES — Runs Great

C51Usable

Estimated from fit model

gemma 3 27b it needs ~25.7 GB VRAM. MacBook Pro M3 Max 48GB has 34.6 GB. With Q4_K_M quantization, expect ~15 tok/s.

Runtime: llama.cppCapacity: RoomyBandwidth: LowStack: StandardBottleneck: Balanced

Operating mode

Choose the run profile you care about

Interactive favors responsiveness, while light API and scale-out lean harder on serving readiness. The fit stays the same, but the recommendation lens changes.

Current mode

Balanced

Balanced for general local use. Keeps the ranking neutral across personal and serving workflows.

Capabilities:

Select quantization to explore

Q4_K_M (Medium quality) — 25.7 GB, 14.6 tok/s, Runs well

25.7 GB required34.6 GB available

74% VRAM used

Fit status

Runs well

Decode

14.6 tok/s

TTFT

13286 ms

Safe context

61K

Memory

25.7 GB / 34.6 GB

Memory breakdown

Weights16.5 GB

KV Cache3.2 GB

Runtime0.9 GB

Headroom5.2 GB

See how fast it feels

See how fast it feelsgemma 3 27b it on MacBook Pro M3 Max 48GB
1st promptCold start — includes initialization
>What is local AI inference?
Local AI inference means running an AI language model directly on your own hardware — your laptop, desktop, or server — instead of sending requests to a remote cloud API.

When you run inference locally the model weights are loaded into your GPU or unified memory. Each token you generate requires reading those weights from memory, so memory bandwidth is the main bottleneck for decode speed.

Key benefits of running locally:
  - Full privacy: your prompts never leave your machine
  - No per-token cost or rate limits
  - Works offline once the model is downloaded
  - Latency depends only on your hardware
2nd promptWarm — model ready, no init overhead
>How much VRAM do I need?
It depends on the model size and quantization level. A rough rule of thumb:

  Model size     Q4 (4-bit)    Q8 (8-bit)    FP16
  7B params      ~4.3 GB       ~7.5 GB       ~14 GB
  13B params     ~7.9 GB       ~13.9 GB      ~26 GB
  70B params     ~42.7 GB      ~74.9 GB      ~140 GB

Most people use 4-bit quantization (Q4_K_M) which gives 90-95% of full quality at a fraction of the memory. A 24 GB GPU can comfortably run most 7B-13B models.
Estimated: 14.6 tok/s decode · 13.3s TTFT (warm) · 36 tok/s prefill

What limits this setup

This setup is broadly balanced for this model.

Shared-memory contention still exists

The OS, browser, and inference runtime all compete for the same physical memory pool, so real-world headroom is less forgiving than raw capacity suggests.

Best improvement path

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	C	Runs well	14.6 tok/s	7247 ms	61K
Coding	C	Runs well	14.6 tok/s	13286 ms	61K
Agentic Coding	C	Tight fit	14.6 tok/s	19325 ms	61K
Reasoning	C	Runs well	14.6 tok/s	15701 ms	61K
RAG	C	Tight fit	14.6 tok/s	24156 ms	61K

Quantization options

How gemma 3 27b it (27B params) fits at each quantization level on MacBook Pro M3 Max 48GB (34.6 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	10.5 GB	Low	C46
Q3_K_S	3	13.2 GB	Low	C47
NVFP4	4

Get started

Copy-paste commands to run gemma 3 27b it on your machine.

Run

lms load hf-maziyarpanahi--gemma-3-27b-it-gguf && lms server start

Upgrade options

Hardware that runs gemma 3 27b it well

MacBook Pro M4 Max 64GBBudget pick

64 GB Unified (+16)546 GB/s (+146)

Raises estimated decode speed by about 129%.33.4 tok/s decode

Raises estimated decode speed by about 129%.

Adds memory headroom for longer context windows and future model growth.

~$3,999 MSRP

RTX PRO 5000 Blackwell 48GBBest value

1344 GB/s (+944)

Raises estimated decode speed by about 369%.68.5 tok/s decode

Raises estimated decode speed by about 369%.

Adds memory headroom for longer context windows and future model growth.

~$4,999 MSRP

Frequently asked questions

Can MacBook Pro M3 Max 48GB run gemma 3 27b it?

Yes, MacBook Pro M3 Max 48GB can run gemma 3 27b it with a C grade (Runs well). Expected decode speed: 14.6 tok/s.

How much VRAM does gemma 3 27b it need?

gemma 3 27b it (27B parameters) requires approximately 25.7 GB of memory with Q4_K_M quantization.

What is the best quantization for gemma 3 27b it?

The recommended quantization for gemma 3 27b it is Q4_K_M, which balances quality and memory efficiency.

What speed will gemma 3 27b it run at on MacBook Pro M3 Max 48GB?

On MacBook Pro M3 Max 48GB, gemma 3 27b it achieves approximately 14.6 tokens per second decode speed with a time-to-first-token of 13286ms using Q4_K_M quantization.

Can MacBook Pro M3 Max 48GB run gemma 3 27b it for coding?

For coding workloads, gemma 3 27b it on MacBook Pro M3 Max 48GB receives a C grade with 14.6 tok/s and 61K context.

What context window can gemma 3 27b it use on MacBook Pro M3 Max 48GB?

On MacBook Pro M3 Max 48GB, gemma 3 27b it can safely use up to 61K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.

Is unified memory on MacBook Pro M3 Max 48GB as fast as VRAM for gemma 3 27b it?

See all results for MacBook Pro M3 Max 48GB See all hardware for gemma 3 27b it

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