Zalman made an all copper with copper fin heat sinking it was in a flower arrangement. Made of less material than the current towers of these days.
At the time the debate was the same copper vs aluminum. The same principles apply today aluminum dissipates heat faster than copper and copper absorbs heat faster than aluminum. Hence all the copper base aluminum fin versions we see today more efficient and less costly.
The trick is the connection fin to heat pipe, I would like to see a heatpipe/fin made out of one piece of material.