It's got a good bearing system, it will probably work in all orientations.
Looks like sandia finally got their fanless heat sink to market.
http://youtu.be/JWQZNXEKkaU
screw that microfuge/heatsink contraption http://www.nature.com/ncomms/2014/140910/ncomms5745/full/ncomms5745.html
Since this things ability to dissipate heat is entirely dependent on the spinning of the heatsink; what happens if that heatsink stops spinning especially on something like a 14 core 1U server? Those Delta blowers usually have a vapor chamber that can keep the processor "operating" in the event of a fan failure.
Next thing you know they put turbos & intercoolers on PCs!