you should seriously note the danger of the cpu screw holders. apple for some reason decided to attach the fricken screw receivers/standoffs via surface mount. they dont have a bottom cap either. use a screw slightly too long or turn too far and pop(screw pushes against motherboard and pops the holder off)... one corner is unable to be screwed in. ask me how i learned this...lol...I cant see how this design decision helps anything but apples wallet. the other side of the board has components smds as well so its not like a really short through hole was undo-able.