Custom CPU water block design improvements reduce thermal resistance by two degrees Celsius

A custom-designed CPU water block achieved a 2°C reduction in average operating temperatures compared to the creator's initial prototype. The performance gain was realized by modifying the cold plate and jet plate assembly to minimize thermal resistance. Specifically, the cold plate thickness was reduced to 1.25mm, bringing the internal fins closer to the heat source. Additionally, the jet plate was redesigned to incorporate a center-fire configuration, which improves fluid velocity and turbulence, effectively disrupting the thermal boundary layer that hinders heat transfer. While the initial V1 design resulted in an average temperature of 81.5°C under load, the refined V2.2 iteration maintained an average of 76.7°C. The creator notes that these modifications were necessary to address issues with O-ring sealing and to ensure consistent contact pressure across the die. The project highlights the iterative nature of engineering custom cooling solutions, emphasizing the importance of balancing flow dynamics, material thickness, and mechanical tolerances to optimize thermal performance in high-heat environments.

The V2.2 water block design achieved an average temperature of 76.7°C under load. Reducing the cold plate thickness to 1.25mm brought the internal fins closer to the heat source.

A center-fire jet plate design was implemented to increase fluid velocity and turbulence. The modifications resulted in a 2°C improvement over the V2 design and a 4.8°C improvement over the V1 design.

The creator utilized a hobby-grade CNC machine to manufacture the custom components. The design process required multiple iterations to resolve O-ring sealing and contact pressure issues.