Acually the process of renaming napoleon.exe to empire.exe is the thing that fixes the multi-core issue, apprently Empire works fine with multi-core and napoleon doesn't yet, a simple renaming makes the engine think that it runs on empire's processor configuration
If you want to revert back you need to uninstall your current drivers, like you can do with most programs through windows removal and then just download the 9.6 drivers for your windows version
About the graphic card question, i have asked myself that very same question ever since i brought myself this card