I'd tested the three heatsinks in my MDD overcloked, where the little diferences are more apreciables.

This are the results:

"thinner finned heatsink"...... 0 C

"Aluminium monoblock".........-1.70 C

"Copper from 1.42"..............-5 C

Regarding motherboards, I think the blue, are the modern ones, or at least more news.

Sorry for my bad English