Ok, out it comes. No better than the Silentboost, and a lot louder (tried passive, the board shut itself off @ 58c and climbing). I suspect my early temps were the result of fresh thermal paste application, and a room temperature heatsink.
I think I'm gonna lop the ends off the heatpipes and hook them up in series for a radiator for a watercooling setup. Running off of 5 volts, they should be quiet and cool well. It was an interesting experiment in cheapskatery nontheless.
Looking closely at the cpu footprint in the thermal paste show that one of the heatpipes is nowhere near the processor, one is directly over it, and the middle one is about 40% over it. Not the best design. Best of luck to those having a different outcome. I don't doubt your experience, although I think the K7S5A monitor is reading something other than the cpu at 19C.