Heat Pipe Question

[UgleeDuck]

For a CPU air cooler, are more smaller diameter heat pipes preferred better for heat dissipation or fewer larger diameter heat pipes. For example, Thermalright Peerless Assassin 120 has 6 heat pipes at 6mm each. Thermalright Frost Spirit 140 has 4 heat pipes at 8mm each. They are about the same size. Assuming same size and same fans (I know there are differences, but trying to hold variables constant) which design is better for cooling?

 

Knowing nothing about this other than the formula for a cylindrical volume, assuming same length, the 4 8mm heat pipes would have 1.18x the volume of the 6 6mm pipes. Does more volume equal better in this case? Thanks.

[wildgg]

5 minutes ago, UgleeDuck said:

For a CPU air cooler, are more smaller diameter heat pipes preferred better for heat dissipation or fewer larger diameter heat pipes. For example, Thermalright Peerless Assassin 120 has 6 heat pipes at 6mm each. Thermalright Frost Spirit 140 has 4 heat pipes at 8mm each. They are about the same size. Assuming same size and same fans (I know there are differences, but trying to hold variables constant) which design is better for cooling?

 

Knowing nothing about this other than the formula for a cylindrical volume, assuming same length, the 4 8mm heat pipes would have 1.18x the volume of the 6 6mm pipes. Does more volume equal better in this case? Thanks.

i don't know anything about the math behind this in terms of volume but i'll chip in my thoughts.

Both coolers use a ''coldplate?'' so neither cooler have the heat pipes touching the IHS of the CPU, with that said, my guess is that the 6x6mm would perform better because if you put 6x6mm heat pipes next to each other you would have a 4mm bigger surface area? 

also, since most CPU dies are in a smaller area under the IHS of the CPU, i'd say having more heat pipes over that smaller area would perform better.
This might be all irrelevant because both use a plate under the heat pipes..

[UgleeDuck]

26 minutes ago, Wildgg said:

i don't know anything about the math behind this in terms of volume but i'll chip in my thoughts.

Both coolers use a ''coldplate?'' so neither cooler have the heat pipes touching the IHS of the CPU, with that said, my guess is that the 6x6mm would perform better because if you put 6x6mm heat pipes next to each other you would have a 4mm bigger surface area? 

also, since most CPU dies are in a smaller area under the IHS of the CPU, i'd say having more heat pipes over that smaller area would perform better.
This might be all irrelevant because both use a plate under the heat pipes..

Thanks, you're right in that the 6x6mm would have a larger cross section in terms of surface area cut across the exact middle of a cylindrical shape within the cold plate. However, the volume of the 4x8mm pipes is more within the cold plate. The 4x8mm will also have a larger total surface area embedded in the cold plate vs the 6x6mm. I wish one of the youtubers did a test to determine which design is better. Maybe the difference is so small that it doesn't matter. Who knows. Just curious what everyone's experience and thoughts are. Thanks.

[freeagent]

8mm pipes are the best. They definitely have more capacity. FC140 is great on AM4 with its 5x 8mm pipes. TS140P was great on older Intel with its 6x 8mm pipes. 6mm pipes still have their place, for now.