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As always I like to take things apart to see what makes them tick. As you can see from the pictures below there are a lot of pieces to the Volcano 9. The actual heatsink is 70x70 mm looking at it form the top. In order to fit the 80mm fan on it they designed a shroud that would screw to the heatsink and then leave plenty of room for the fan to attach. Very nicely done and shiny! Everything is secured rather well and I don't see any problems with pieces falling off any time soon.
Now the heatsink itself is made of aluminum and has a copper insert pressed into the bottom of it. While that is how a lot of places seem to do it Thermaltake has done something that to me doesn't make a lot of sense. The copper insert goes all the way through the base of the heatsink. What this does is cause some of the fins to overlap onto the copper. To me this would seem to degrade the performance of the heatsink. It would have made a lot more sense to leave that portion of the heatsink intact so that the copper would have 100% contact with the aluminum and more effeciently dissapate the heat. I'm sure they have their reasoning behind this so I'll leave that up to their engineers.
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