As part of a new rig build, do you need to buy stand off screws for the motherboard? or do these come with the case?
Agreed, every case I've ever build in has provided a back of screws and board mounts to fit all board sizes.
Most of the time this is true - sometimes case manufacturers do other things though, like in the corsair carbide 300R where the mobo tray is shaped instead. I have heard stories that these can lead to shorts in the board though...