I think I know what Wolfram23 meant, the IGP at the Socket 775 tend to look fuzzy, especially with VGA connection.
Yeah, basically this. The picture became sharper and brighter colours - which, I know, you can modify settings for that sort of thing kind of like more bloom effect. Maybe it was just the transition from VGA to DVI, but I first lent her a GT 240 and it was definitely a better picture, then I took it back (it's my PhysX card), and then we got her a 5770 and again it looked better.
I know in theory it should all be the same, but it's not. Again, maybe just was the VGA connection itself.