do you need two GPUs for local AI? the honest answer for running 70B models at home

A second GPU doubles your VRAM, which unlocks 70B models — but it's not free performance, and most people don't need it. Here's when a dual-GPU… Aliteq Ravi Malhotra · Hardware Editor

Most people don't need two GPUs — one 24GB card runs up to 32B models, which is plenty.

Dual-GPU unlocks 70B models — two 24GB cards (e.g. 2x RTX 3090) pool 48GB of VRAM.

VRAM pools, but speed doesn't double — for inference, two cards split the model, they don't run 2x faster.

Costs beyond the GPUs: a bigger PSU, a motherboard with the right slots/lanes, more heat and space.

Cheaper 70B path first: check if a single 32GB card or CPU-offloading meets your need before doubling up.

For most people, no — one 24GB card runs up to 32B models, which covers nearly all local-AI use. Build dual-GPU only if you specifically need 70B models, where two 24GB cards (2x RTX 3090, ~48GB)…

Do you need two GPUs for local AI?

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