It does. The hunk of metal has more surface area than the processor, more surface to radiate, conduct, and convect the heat away. It doesn't matter if you use

It does. The hunk of metal has more surface area than the processor, more surface to radiate, conduct, and convect the heat away. It doesn't matter if you use metal or water to move the heat to the air, your still sinking it to the air, hence the name heat sink. So a hunk of metal does cool things, it cools things better if you add more surface area by adding fins.