Comparison
Mac mini M4 24GB vs NVIDIA GeForce RTX 4090 for local LLMs
Mac mini M4 24GB (18GB usable, 120 GB/s) vs NVIDIA GeForce RTX 4090 (24GB usable, 1010 GB/s) for local LLMs: capacity decides which models load at all, memory bandwidth decides the speed tier. Verdicts below are computed per model at each machine's best clean quant.
| Spec | Mac mini M4 24GB | NVIDIA GeForce RTX 4090 |
|---|---|---|
| Type | Apple prebuilt | NVIDIA GPU |
| Memory for models | 18 GB GPU-usable unified | 24 GB VRAM |
| Memory bandwidth | 120 GB/s | 1010 GB/s |
| Price | $999 base price | $1,599 MSRP |
| TDP | — | 450 W |
| Backends | Metal | CUDA · Vulkan |
| Gaming (estimate) | — | 4K-class |
Specs as of 2026-07-11 / 2026-07-08 — sources on each product page. Gaming tier is estimated from FP32 compute, not a game benchmark.
What each can run, head to head
The 12 most-downloaded models we track, each graded at that machine's best clean-fit quant (llama.cpp, 8K context). Click a verdict for the full breakdown.
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Verdicts computed from published specs and measured GGUF sizes — how the math works.