EVGA X99 User Manual page 5

Above, all locations safe to secure the board to a standoff with are

circled in red, and the upper left side of that picture is a zoomed in
view of the hole.
Keep in mind that when the screws are installed but not fully tightened,

the motherboard should have 1-2mm of movement; this can help with
getting cards mounted or other tight tolerance/close fitting cards.
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