Mac Studio M5 Ultra vs NVIDIA DGX Spark: Which $5,500 Local AI Box Wins?

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Apple's newly announced Mac Studio M5 Ultra and NVIDIA's DGX Spark are two competing desktop AI machines priced around $5,500, both designed for running large language models locally without relying on cloud services. The M5 Ultra offers up to 512GB of unified memory with 1.2TB/s bandwidth, giving it roughly 4.4 times the memory throughput of the DGX Spark's 273GB/s — a significant advantage for LLM inference speed. The DGX Spark, priced at $4,699 and available now with 128GB of memory, counters with full CUDA ecosystem support including TensorRT-LLM, vLLM, and NVIDIA's fine-tuning toolchain. For raw token generation on large models, the Mac Studio holds the edge, while the DGX Spark is better suited for fine-tuning workflows and CUDA-dependent software stacks. The two machines ultimately target slightly different users, with Apple prioritizing massive model capacity and NVIDIA focusing on developer ecosystem depth.

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