Apple Mac Studio M5 Ultra 512GB (2026)
512GB: the largest single-box local LLM memory below datacenter gear; fits very large MoE models at 4-bit. Expensive; prompt processing on long contexts is the weak point.
Software: macOS. Best stack: MLX, llama.cpp (Metal), Ollama/LM Studio. No CUDA: most PyTorch training recipes and CUDA-only tools won't run or run slowly (MPS backend).
Specs: official spec page
Apple · ai-desktop · 512 GB unified memory · 1.2 TB/s memory bandwidth · tags: apple, mlx, unified-memory, m5
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Server GPUs are scam-prone. Check seller history and photos; anything under about €7000 is likely broken, parts-only or fake.