I'm using a Sapphire HD5870 and I'm playing GTA4. There are these annoying stutters my fps is running around 30-40. When I look at things, the boxes and shadows are barely finished loading. I switched to my 9800GT and tried the game out, and the game is running smoothly. I'm running it around 60 fps with no stutters. This is weird, because when I was playing Bad Company 2 on the 5870 card, the fps is around 60-120. On this card, Bad Company 2 is running around 40-60. Any suggestions?