FrostyTech posted a review on the BeQuiet Pure Rock Heatsink
A quote from the article:
On the test bench today we have BeQuiet's Pure Rock heatsink - a 155mm tall tower cooler built around four 6mm diameter copper heatpipes and paired with one of BeQuiet's 'Pure Wings 2' low noise 120mm fans.BeQuiet Pure Rock Heatsink Review @ Frostytech