ok soo u made gpu-z screenshot.
Thats a start.
Now make bios dump.
I would be interested in comments from others who have a working, stable installation using Clover as to whether I have unneccesary items in my config.plist.
Have a look at my guide, it could help you: http://www.tonymacx86.com/mavericks-desktop-guides/128986-ultrazones-guide-z77x-ud5h-mavericks-clover-uefi-mode.html
Good luck!
Interesting guide - it does raise a question for me - when you used Clover Configurator for the system definition why did you use an external editor rather than just use Clover Configurator to update your config.plist? I just use Clover Configurator and certainly so far has given no problem.