Thanks for your reply Angelo...I should check my best stable clocks and Voltage...But i can tell you now that the best Voltage for My vga is SAPPHIRE TRIXX +160...So i can run 1180/1410 and i have the bests results...with higher ram frequency or gpu clock the results are Lower...On Unigine Heaven for example, io can do the bench 1200/1410, but the file saved result invalid when i submit on hwbot...mybe the fps throttle ?