Except the complaint above is somewhat legitimate since tuning in Linux is widely known not to be quite the same quality as windows and I don't think anyone in there right mind would argue that windows offers much better support for gaming at this time(although that's slowly changing).
Gaming... ?
I was strictly speaking about mining issues. What is difficult to tune?
There are two major limitations (for 7XXX): You cannot alter the voltage or set memory clock more than 150 Mhz lower compared with the GPU clock. (both issues can be fixed with a BIOS flash, although the 7xxx bios editing is not quite straightforward)
Other than that you can tune pretty much everything else I can think of.
Back to Windows, so I read about Windows 8 being able to work with 5 7XXX cards using 13.1.
Can you try that?