On the evaporator area, an expanded diameter design benefits the conducting area with powdered wick structure inside of the heat-pipe, carrying more energy through phase changed vapor.
The other side of the tube is considered as condenser side. A smaller diameter tube allows smaller bending radius, and brings in a better space arrangement of heat-pipes line-up.
Below is the performance chart for comparison.
An dual diameter heat-pipe is expanded from 6mm to 8mm. Its performance line is marked with green triangle.
The expansion gives the dual-diameter heatpipe a close performance as 8mm diameter heat-pipe. And its advantage is shown on price, performance and bending space.
Performance Comparison
A previous Cooler Master retail heatsink has four 6mm heat-pipes on the module. Cooler Master modified the design, and latest proposal is a module with 3 dual diameter heatpipes. Those two modules have the same performance but the latest proposal will lower the cost.
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