Asus TS300-E8-RS4-C - Manual (Page 62)

Chapter 4: Motherboard information 4-6
4.2 Expansion slots
In the future, you may need to install expansion cards. The following subsections
describe the slots and the expansion cards that they support.
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.
4.2.1 PCI Express x16 slot (x16 link)
The onboard PCIE6 slot provides one x16 Gen3 link and auto switches to x8 link
if PCIE5 is occupied. This slot supports VGA cards and various server class high
performance add-on cards.
4.2.2 PCI Express x8 slot (x8 link)
The onboard PCIE 4 and PCIE 5 provide one x8 Gen3 link. These slots support
VGA cards and various server class high performance add-on cards.
4.2.3 PCI Express x1 slot (x1 link)
The onboard PCIE 3 and PCIE 7 provide one x1 Gen2 link to the Intel ® C224 PCH.
4.2.5 PCI slot
The PCI 1 and PCI 2 slots supports cards such as LAN, USB, and other cards that
complies with PCI specifications.