Aluminum isn't a very good conductor of heat, just FYI. It's a great dissipater, but a bad conductor. You'll want to make sure you use a really good thermal paste.
Thermal conductivity is the ability to transfer heat, and it has to do with free electrons and atomic structure. It doesn't matter if it's conducting heat to itself or other materials, the property is the same.
Thermal conductivity is the ability to transfer heat, and it has to do with free electrons and atomic structure. It doesn't matter if it's conducting heat to itself or other materials, the property is the same.