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I am getting a little nerdy here but I would like to do this a scientifically as possible.. Now what I am trying to determine is what is the required thermal conductivity needed (W/m-K) for a CPU running at 85degrees C with Copper as the heatsink.. I am really needing an answer to this not just I think this is the best..

here is the Formula I just need to know how I will find out the BTU's of said CPU??

thermal conductivity:

W/m-K = 1.7307 x Btu/hr-ft-F

W/m-K = 418.68 x cal/s-cm-C

Now I seen a few Shootouts of what they say is good and all I am just trying to take a more scientific approach to this problem, Perhaps someone here is as geeky..

I also want to point out if I only need a 3.8W/mK I will not bother with a higher amount, hopefully you see where I am going with this..

Or if there is an easier method to determine the required W/mK I am all ears..