AI-NT-No-Problem: Cramming a 9950X3D and RTX 5090 Into an SFF Custom Loop

Short summary

A software engineer migrated a Ryzen 9950X3D and RTX 5090 workstation into a compact SFF case with custom hardline water cooling, achieving 15°C GPU temp reduction and 26-70W power efficiency gains under AI inference workloads. Fan noise dropped to zero as the stock air cooler was replaced with a shared thermal loop using two 240mm radiators. The entire project—thermal test framework, migration checklist web app, and 873-line bash sensor monitoring script—was built using a Claude Code AI agent.

• •GPU temps dropped from 66°C to 51°C under inference load; power efficiency improved 26-70W
• •Custom hardline water loop reduced GPU fan duty to 0%, eliminating noise entirely
• •Full project including automated testing built using Claude Code AI agent for rapid iteration

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