Tyan Computer TOLEDO S5520 - Manual (Page 20)

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2.4 - Tips on Installing Motherboard in Chassis
Before installing your motherboard, make sure your chassis has the necessary
motherboard support studs installed. These studs are usually metal and are gold
in color. Usually, the chassis manufacturer will pre-install the support studs. If
you are unsure of stud placement, simply lay the motherboard inside the chassis
and align the screw holes of the motherboard to the studs inside the case. If
there are any studs missing, you will know right away since the motherboard will
not be able to be securely installed.
Some chassis’ include plastic studs instead of metal. Although the plastic studs
are usable, TYAN recommends using metal studs with screws that will fasten
the motherboard more securely in place.
Below is a chart detailing what the most common motherboard studs look like
and how they should be installed.