FrostyTech posted a review on the OCZ Vendetta 2 Exposed Heatpipe Base Heatsink

The OCZ Vendetta 2 heatsink features three large copper heatpipes that make direct contact with the top of the processor. This approach takes advantage of the superior heat conducting capabilities of 8mm diameter heat pipes to efficiently move heat from the processor to the cooling fins, without any intermediary steps. The technique is called Heatpipe Direct Touch, and as you've seen by the Top 5 Heatsinks chart... it's a winner.

OCZ Vendetta 2 Exposed Heatpipe Base Heatsink Review