Hi guys i just got an HD6990 and i was wondering what is the problem.. I upgraded from a GTX580(which could play all my games on ultra or at least high with a decent framerate) my 6990 lags on textures on medium graphics settings.. How is this possible with this seemingly more powerful card?? Could it be that my Corsair GS700 PSU is just not getting enough juice to the card?? Please I'm not ******ed.. The screen is plugged into the right port and I have the latest drivers.. All crossfire settings in CCC are enabled... Please i just need an answer as to if it's possible for this to happen?