The GB10’s CPU-outpacing-GPU temperatures come from a performance-pinned CPU governor and a GPU-temperature-driven fan curve; fan override via the EC, schedutil, and SoC power caps fix it better than more GPU downclocking.

How to power and RPM-control an external 120 mm duct fan for a GB10 machine from a 5 V USB-C port, a $28 thermostat, or a scripted controller reading nvidia-smi.

Measured STL volumes, filament prices, and service-bureau quotes for a GB10 cooling duct and risers: DIY in ASA costs about $27 in filament versus $120–$450 delivered from a service, a 5–15× markup.