well every single time i ever see a brand name case its quite because it doesnt have a graphics card they use onbored graphics, and they only have one fan cooling the cpu
theres the quite
they also have perfect fit because that case is made for whats going in it, have you seen those computer cases dells made that are like 3 inches thick, only enough room for a custom power supply that is smaller then a atx or mini atx power supply, and a motherbored along with a stacked disk drive and harddrive on there sides,
if you wanted to put a graphics card in that you couldnt even do it, ive modded a dell case before it was the thickest metal ive ever cut through on a computer,
a big brand has a strong computer case because thats good quality, if dell or hp sold a computer case that bends when you take off the side everyone would say dell sucks i had to buy a whole new case for my computer.