Asus P8B-X - Manual (Page 38)

2-20 Chapter 2: Hardware information
2.5.4 PCI Express x8 slot (x4 link)
The onboard PCI Express x8 slot provides one x4 link to C202. This slot supports
various server class high performance add-on cards.
2.5.5 PCI Express x16 slot (x16 link)
The onboard PCI Express x16 slot provides x16 link to CPU. This slot supports
VGA cards and various server class high performance add-on cards.
2.5.6 PCI Express x1 slots (x1 link)
The onboard PCI Express x1 slots provide x1 link to C202. This slot supports VGA
cards and various server class high performance add-on cards.
2.5.7 PCI slots
The PCI slots support cards such as a LAN card, USB card, and other cards that
comply with PCI 2.3 specifications.
PCIEx16 slot
(x16 link)
PCI slots PCIEx1 slots
(x1 link)
PCIEx8 slot
(x4 link)