For Sandy Bridge at least the motherboard cut-out is entirely misplaced in the HAF-X, while the Level 10 GT has a good bit of extra space.
Motherboard manufacturers position the cpu to their liking or to their design at least.
Take for example the two following x58 mobo images.
In the evga case one would have a problem with the cut out on any given case.
I pretty sure you can find respective examples in the sandy family of boards.