The bottom of the SLK is unique, and is the reason why those non conductive pads are included. The fins at the bottom allow air from the fan to get through to the CPU. Instead of a big copper cooler covering the core and entire surface of the CPU while a fan cools the heatsink, we see that the SLK-800 has a narrow base so that while some of the air is being directed on the copper the rest is allowed to directly reach the CPU itself.
The narrow base calls for some unordinary installation measures, and here some sort of included documentation would have been nice. After putting a bit of thermal compound on the core and removing the protective covering off the base of the SLK-800, you attach four of the included pads to the corners of the base. It is too narrow to fit on the Athlon’s pads, and a cracked core is my idea of a very bad day. Then it's time to use the "World’s worst clip™". Take extra caution with this, or you may end up with an extra hole around the socket with a screwdriver through it. Finally, the last step is to attach the fan with the retention wires. There are three sets of holes at 38, 25, and 15 for different height fans. Again, some sort of documentation would have been helpful.
