Asus H81M-E - Manual (Page 10)

1-2 Chapter 1: Product introduction
H81M-A
Place this side towards
the rear of the chassis
1.2.2 Screw holes
Place six screws into the holes indicated by circles to secure the motherboard to the chassis.
Do not overtighten the screws! Doing so can damage the motherboard.
H81M Series motherboards include H81M-A and H81M-E models. Package contents vary
between models. The layout illustrations in this user guide are for H81M-A only.