...shouldn't gravity have an equal effect on the HSF
Sorry, I did make a big typo in my first post and it has been edited to be correct.
But...I was referring to the horizontal or vertical orientation of the heat-pipes themselves, which in one position the cooling agent they use in the heat-pipes will be traveling across a vertical plain and the other a horizontal plain(HERE
is a link to a large picture, I didn't want to load it on the thread) of the supposed better position in the context of better cooling performance out of the heat-pipes.
I will try to locate the article I am referring to.
[UPDATE] - This is not the article I read but it does prove the same point, but due to the design of the HSF they used the results were amplified. http://vr-zone.com/articles/Scythe_Zipang_-_Super_Size_Me!!/5536-5.html