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What consumes GPU memory during training/inference, and how do you fit a model that doesn't?

OOM is the most common wall in deep learning, and 'buy a bigger GPU' is the weakest answer. The signal is naming the memory consumers, knowing which one dominates, and matching the right lever to it.

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

OOM is the most common wall in deep learning, and 'buy a bigger GPU' is the weakest answer. The signal is naming the memory consumers, knowing which one dominates, and matching the right lever to it.

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