2-15ASUS E SC8000 G42.5 Expansion slotsEnsure to unplug the power cord before adding or removing expansion cards. Failure to doso may cause you physical injury and damage motherboard components.2.5.1 The PCI Express riser cardThe server system comes pre-installed with a riser card that supports two x16 slots (Gen3x16 link) for installing PCI-E x16 low profile of half-length cards.To install PCI-E expansion cards to the riser card:1. Remove the two (2) screws that secure the riser card to the chassis.2. Firmly hold the riser card, slide the riser card towards the front of the chassis to unlockit, then pull it up to detach it from the chassis.