Asus M2N-X - Manual (Page 19)

ASUS M2N-X 1-7
M2N-X
R
Do not overtighten the screws! Doing so can damage the motherboard.
1.5.2 Placement direction
When installing the motherboard, make sure that you place it into the
chassis in the correct orientation. The edge with external ports goes to the
rear part of the chassis as indicated in the image below.
Place this side towards
the rear of the chassis
1.5.3 Screw holes
Place six (6) screws into the holes indicated by circles to secure the
motherboard to the chassis.