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Fine-tuning a 7B model needs 112 GB. The model is only 14 GB of it.

Ask how much memory it takes to fine-tune a 7B model and the instinct is "the model's 14 GB in fp16, so a bit more than that". The real figure is about 112 GB, before you've stored a single activation. The model is 14 GB of it. Once you see where the other 98 GB goes, LoRA and QLoRA stop looking li…

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  1. 2026-10-03 04:00 · DEV Community — Machine Learning
    Fine-tuning a 7B model needs 112 GB. The model is only 14 GB of it.

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