Also note: You NEED an EPS capable PSU, meaning you HAVE to connect both an 8pin and a 4pin 12V power connector to the mobo. If any one is missing, the Z7S will NOT post.
Mmm....if you want to test the board, and have only 1x Xeon installed, you don't need the 8-pin connector, only ATX and 4-pin.

Just some usefull/useless info

If you use a socket 604 HS on a socket 771 board the HS will not make full contact with the cpu.
Socket 771 cpu's sit lower on the board than the 604's did and the HS for them have shorter "posts" to allow for the difference.
App 3/32" if I remember and I learned the hard way.
Good, useful information.

a Little more then: This board ships with 3x different length "posts" to screw into the backplate, to accommodate different mounting posts on various incarnations of Xeon heatsinks. As Movieman stated above, make sure to use the correct length that will assure good clamping pressure on the cpu.