S!
I recall the UDV feature in AMD cards locked clocks to 300MHz or so as above that UDV does not work properly. And this is for video things. Basically it could be that the video makes the card run at 300MHz but for some reason does not recognize the 3D mode coming after that. So disabling the intro movie helps you to keep full clocks.
Another trick to make clocks go up(tested ages ago with 6970HD) was to overclock your card for example with a mere 5MHz and it ran full speed. Sometimes had this phenomenon that card was running at arounf half MHz in game. OC helped with this.
I do not think we have a real full screen yet. In other games I do not have this where the desktop flashes upon starting a game, in CoD I can see the start menu button etc. briefly when the game loads.
But anyways tips for better performance with AMD cards: disable Intro.vmw and OC your card just a little bit. At least the intor thingy will help.
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