MacBook Air M4 24GBBudget pick
24 GB Unified (+6)
A
Adds memory headroom for longer context windows and future model growth.34.3 tok/s decode
Adds memory headroom for longer context windows and future model growth.
~$1,099 MSRP
Can Phi 3 Mini 3.8B run on MacBook Pro M3 Pro 18GB?
YES — Tight Fit
B69Good
○Estimated from fit model
Phi 3 Mini 3.8B needs ~11.0 GB VRAM. MacBook Pro M3 Pro 18GB has 13.0 GB. With Q4_K_M quantization, expect ~47 tok/s.
Runtime: llama.cppCapacity: TightBandwidth: Very lowStack: StandardBottleneck: Memory bandwidth
Share:
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.
Select quantization to explore
Q4_K_M (Medium quality) — 11.0 GB, 47.2 tok/s, Tight fit
11.0 GB required13.0 GB available
85% VRAM used
Fit status
Tight fit
Decode
47.2 tok/s
TTFT
4098 ms
Safe context
21K
Memory
11.0 GB / 13.0 GB
Memory breakdown
Weights2.3 GB
KV Cache5.9 GB
Runtime0.9 GB
Headroom1.9 GB
See how fast it feels
See how fast it feelsPhi 3 Mini 3.8B on MacBook Pro M3 Pro 18GB
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: 47.2 tok/s decode · 4.1s TTFT (warm) · 118 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 | A | Runs well | 47.2 tok/s | 2235 ms | 21K |
| Coding | B | Tight fit | 47.2 tok/s | 4098 ms | 21K |
| Agentic Coding | F | Too heavy | 32.5 tok/s | 8652 ms | 21K |
| Reasoning | B | Tight fit | 47.2 tok/s | 4843 ms | 21K |
| RAG | F | Too heavy | 32.5 tok/s | 10815 ms | 21K |
Quantization options
How Phi 3 Mini 3.8B (3.799999952316284B params) fits at each quantization level on MacBook Pro M3 Pro 18GB (13.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 1.5 GB | Low | B64 |
Q3_K_S | 3 | 1.9 GB | Low | B64 |
NVFP4 | 4 |
Get started
Copy-paste commands to run Phi 3 Mini 3.8B on your machine.
Run
ollama run phi3:miniUpgrade options
Hardware that runs Phi 3 Mini 3.8B well
MacBook Pro M3 24GBBest value
24 GB Unified (+6)
B
Adds memory headroom for longer context windows and future model growth.29.3 tok/s decode
Adds memory headroom for longer context windows and future model growth.
~$1,099 MSRP
MacBook Air M3 24GBApple upgrade
24 GB Unified (+6)
B
Adds memory headroom for longer context windows and future model growth.29.3 tok/s decode
Adds memory headroom for longer context windows and future model growth.
~$1,099 MSRP