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What is QLoRA, and how does it make fine-tuning large models feasible on one GPU?

Fine-tuning a 65B model used to mean a node of A100s. QLoRA collapses it onto one card with three specific tricks. The signal is knowing what gets quantized, what stays trainable, and why quality barely moves. Here is the answer.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Fine-tuning a 65B model used to mean a node of A100s. QLoRA collapses it onto one card with three specific tricks. The signal is knowing what gets quantized, what stays trainable, and why quality barely moves. Here is the answer.

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