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How do you select GPUs for LLM training and inference, and what specs actually matter?

Picking GPUs is a real applied decision, and 'get the biggest one' misses the point. The signal is knowing which spec binds your workload (VRAM, bandwidth, interconnect) and the train-versus-serve difference that flips the answer.

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

Picking GPUs is a real applied decision, and 'get the biggest one' misses the point. The signal is knowing which spec binds your workload (VRAM, bandwidth, interconnect) and the train-versus-serve difference that flips the answer.

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