Define workload, reliability, noise, budget, and upgrade needs before choosing parts.
Needs that change hardware
Gaming resolution, video editing format, virtual machines, classroom reliability, small-desk size, quiet operation, Wi-Fi needs, storage growth, and warranty expectations all influence the build.
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Ask what the user does every week, not only what they hope to do one day.
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Separate must-have requirements from nice-to-have preferences.
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Document assumptions so future support has context.
Budget as a design constraint
A budget does not mean choosing the cheapest version of every part. It means spending where the user will feel it and protecting support parts that keep the machine stable.