MACSTUDIOS.NET · Field Guide · Data verified Jul 2026
Cheapest Mac to run Llama 3.1 405B
405B parameters · quality index 28 · coding 33 · every Apple Silicon Mac ever sold, compared.
The cheapest Mac that runs Llama 3.1 405B comfortably is a used Mac Studio M3 Ultra 32c/80c 512GB (2025) at about $7,457 EST. on the used market — running Q6_K quantization at roughly 1.3 tok/s with up to 128K tokens of context.
Every Mac that runs it, by used price
| Machine | Used price | Runs at | Est. speed | Max context |
|---|---|---|---|---|
| Mac Studio M3 Ultra 32c/80c 512GB (2025) | $7,457 EST. | Q6_K | 1.3 tok/s | 128K tokens |
Run it
ollama run llama3.1:405b pulls the default (≈Q4) build once you have Ollama installed.
Or skip the hardware
Cloud APIs serve Llama 3.1 405B at about $3.5 per million output tokens. The main site's break-even solver computes the daily usage where owning a Mac becomes cheaper than renting.
Open the interactive guide — speed simulator, TCO, all 75 machines →Estimates: used prices are market ballparks, speeds are bandwidth-model estimates (±30%) calibrated against llama.cpp benchmarks — the methodology documents every formula. Computed from the same dataset as the live tool.