I count four pipes in the pictures...Examination:
The Noctua NH-U12DX is made mostly of aluminum with a dynamic fin shape and a set of three copper heatpipes that run from the copper base of the heatsink up through the many fins.
Phoronix: Noctua NH-U12DX Xeon Heatsink
Quite infrequently do we look at cooling products at Phoronix, but when something interesting comes along, we certainly snatch up the opportunity to look at something new and unique. An example of this is with the Noctua NH-U12DX, which is a heatsink designed for Intel's Xeon processors, but it does not share many traits with most workstation/server heatsinks. This tower heatsink with three heatpipes can also be setup in an air-duct design for dual Xeon systems where a the 120mm fans can push air across two NH-U12DX coolers.
http://www.phoronix.com/vr.php?view=13545
I count four pipes in the pictures...Examination:
The Noctua NH-U12DX is made mostly of aluminum with a dynamic fin shape and a set of three copper heatpipes that run from the copper base of the heatsink up through the many fins.