PCs are getting faster and better overtime, but you can't just look at a PC Case and say its a fast PC. You have to look inside the PC to see all the components. Underneath the case is where all the components and parts are at, so you can make your own computer or replace different parts. but most people just use PCs and don't know what's inside or what each part does. Each part has it's own important role in making the PC the way it is.