Asus ESC500 G3 - Manual (Page 41)

2-21 ASUS ESC500 G3
2.7 Expansion slots
Ensure to unplug the power cord before adding or removing expansion cards.
Failure to do so may cause you physical injury and damage motherboard
components.
Slot No. Slot Description
1 PCIe 3.0 x16 (single at Gen3 x16 link or dual at x8/x8 mode)
2 PCIe 2.0 x1 slot (Gen2 x1 link)
3 PCIe 3.0 x16 (single at Gen3 x8 link or dual at x4/x4 mode)
4 PCI slot
5 PCIe 3.0 x16 slot (Gen3 x4 link)
6 PCI slot
7 PCIe 2.0 x16 slot (Gen2 x4 link)
Slot 1 auto switches to x8 link if slot 3 or slot 5 is occupied; Slot 3 auto switches
to x4 link if slot 5 is occupied.