Copper - the ultimate heat dissipater, short of cost-prohibitive Silver. I doubt we will see solid silver CPU heatsinks anytime soon, and as such, pricey but affordable Copper has made its stance in this business. Thermalright has been producing multiple award-winning coolers for Pentium4 and Athlon XP CPUs for a number of years with their SLK series of products. Today, we look at their new big brother - the SLK-900U.