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    Problem with HD 4870

    Hi u all, im new one here and i kinda need some help. I have a Sapphire HD 4870 512mb version and i don't get it if it has a problem or is smth else wrong. The porblem is, when i go to CCC , OC my card even just a little bit (from 750 to 770 and from 900 to 920) it starts to lagg and i lose...