AI
Multi-GPU for Local AI in 2026: Two Used 3090s vs One RTX 5090
Two used RTX 3090s give you 48GB of VRAM for a third of a 5090's price — so is a dual-GPU build the smart move for local AI? The honest math, whether models really split across cards, and the power-and-complexity costs the sticker price hides.
Lena Fischer · 1h ago · 8 min