My nVidia 8800GT 500mb graphics card died recently but I had a spare ATI HD4670 500mb available. It works but leaves a layered sky when in full screen mode. In window mode it looks better. I did not change the FS settings and set the card settings the same as the 8800GT. Since then I have tried every combination of settings I could come up with but it does not change the layering. Does anyone familiar with this card have any advice on a fix or is it just inherent in this card? All weather is cleared in the screen shots.