1. Depends. I have a D530 case at home that is a normal midtower that will fit full size cards. Limited length though because of the hard drive cage.You need a low profile card for that system as it's a slim tower. I think the Radeon X1950 XT was the fastest AGP card ever made, but it's not going to fit in your PC.
Sorry my bad didn't release ATI released an AGP 3870, I thought the X1950 was one of the last. Yes a 3870 would smoke an X1950.wolfeking said:HD3870 was the fastest from what I hear.