I've noticed when installing a PCI card into my uncles slimmer business pc that desktop pc cases are way too big and that most things like PCI cards are built with bulk purposely to fit in cases. (I had to remove that metal thing, sand it down about 2 inches, and then put it back in for it to fit in the slim pc). So yea why are PC cases so big when all the components inside can simply but put at another direction like sideways to save space.