hey guys i just bought an evga geforce gtx 590 classified..and i dont get it? says memory bandwidth : 331.7GB/sec ..when i check gpu-z it says memory bandwitdh : 165.3 GB/sec...im new to video cards..will i get full 331 GB/sec band width, how ? do u gotta run it in sli..is this card actually good. or should i go with an ati hd 7970.? which 1 of these cards should i go with..any help is greatly appreciated..thanks guys....also i do a lilbit of gaming and both these cards are prolly way more then what i need , but i got um and need ur help, too help me which 1 would perform better. imnn all cases.. gaming , blu-ray playback ,movie converting ect ect. thks again