Gyrotweak has a all copper hsf shootout...
A good read for anyone who wants to keep their CPU cool! =)
Today in the world of cooling, copper is the supreme ruler. Many coolers
that get released are copper based, and they use a unique technology called
"Microfin". Microfin technology allows for maximum surface area on
the heatsink base, which allows the CPU fan to cool the heatsink more efficiently.