Best desktop PCs for running local AI models

Top pick: Corsair AI Workstation 300. It's built for exactly this — a Ryzen AI Max+ 395 with up to 96GB of shared VRAM and 128GB of memory, so you can load big models (70B-class quantized, large image models) without a discrete GPU's VRAM ceiling. It's a workstation, not a gaming rig, so it's quiet and upgrade-friendly.

Who the others suit:

• Minisforum MS-S1 MAX "Local AI Pilot" — same Ryzen AI Max+ 395 idea in a compact box; the value route to unified memory.
• NVIDIA DGX Spark — 128GB unified memory and NVIDIA's own AI stack; best if you want CUDA tooling and a supported reference platform.
• Stormcraft Phantom (RTX 5090) — fastest raw GPU for image generation and fine-tuning, but 32GB system RAM and one card's VRAM limit it for huge models.
• Lenovo ThinkStation P2 / HP Z2 Mini — pick these if you want a business workstation with warranty support and a discrete RTX card.
• Minisforum AI X1 Pro / GEEKOM A9 Max — small, efficient NPU boxes for lighter models and CPU/NPU inference.

Skip the cheap mini PCs and integrated-graphics towers here: no real GPU memory for local models.