It's a thermosyphon, not a heat-pipe (no capillary action, just gravity for flow return) and it's another copy of the old (6+ months ago) Calmera KS10 from Noiseless Cooler (manufacturer is always LG Tech.). Asetek just does a little trick to avoid the loop (test here :
http://www.cooling-masters.com/articles-28-18.html , not too bad) :
Calmera KS10 2&3 tubes version
Nothing new under the sun...