This heatsink is quite similar in design to some of the Zalman CNPS coolers we have tested in the past; the fan sits embed inside the heatsink, the aluminum fins extend towards the outer edges of the fan to increase the total surface area which can be used for cooling.
Looking at the HSF from the side reveals that the lower part is smaller in diameter to avoid issues installing the unit on motherboards which feature larger northbridge cooling solutions.
Zooming in onto one particular area of the HSF reveals a small switch which controls the fan speed; setting it to “high” will allow you the fan to speed up to maximum rpm of 2900, when you set it to “low” the fan rpm tops out at ~2000.
The transparent fan is only slightly smaller than a reference 120mm fan, which is too bad as you won’t be able to swap it out if you want to modify it with a quieter unit.
The base of the unit is copper and nicely finished. In the photo below we removed the pre-applied thermal paste which Intel puts on all their bundled heatsinks.Installation
As you can see in the photo above, this heatsink uses push pins, motherboard removal is recommended in order to be able to reach all the push-pins.
Inside the Antec Sonata 2 the Extreme Intel HSF fits with room to spare;
Onto the test setup ->