Installing The Fans
This part of the EKL Peter’s installation actually does get covered well in the heat sink's manual. After all, it’s important that the fan sits securely in its position in the case. The back plate really needs to be installed correctly, as it provides a lot of stability.
Connecting The Power
We could swing for the fences, giving this setup the maximum possible cooling performance with 12 V connectors for both fans. That's not really necessary to keep AMD's Radeon HD 7970 GHz Edition cool, though. You can safely choose a lower voltage and, consequently, enjoy a more conservative noise profile. Using 7 V for the fan above the GPU and a 5 V hook-up for the other one is a great compromise. Only one cheap part, pictured below, is needed for this arrangement.
This simple solution works just as well as more complicated/expensive ones. Take a look at the benchmark results on the next page to see how temperature and noise stack up.