Individual or looped heatpipes-which is better?
It probably won't make a measurable difference, and there won't be a circular flow or anything like that. The way heatpipes work is that there is a metal sponge inside the pipe (in the attached pic), the fluid in the sponge evaporates absorbing energy and the gas flows down to a cooler part of the pipe, there is condenses back into a liquid. Capillary action then wicks the fluid back to the hot area. The heatpipe being circular wouldn't affect this process.
As for metal based heatsinks, there won't be much of a difference there either. As long as there is proper contact between the cpu and the heatsink it doesn't matter. The metal base will be made out of a highly heat conductive metal and it's mass is fairly low so it's really not much of a barrier for the heat to travel into the heatpipes.
The only thing that makes an actually measurable difference to heatsink performance is sheer mass and surface area (assuming your fans and airflow are the same).
So basically biggest is best.
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