For all the DGX Spark owners who are interested in a cooling solution: 3D printable "forced induction" fan shroud for the sparks. This allows for a 120mm Noctua PPC 3000rpm fan to force air through the intake of the unit, drastically increasing airflow through the internal heatsinks.
Asus GX10s ran cooler by ~19°C under heavy load.
Nvidia DGX Spark ran cooler by ~10°C under heavy load.
This eliminates the overheating issue, as long as you don't mind the fan noise.
3D files are on my repo