Asus KCMR-D12 - Manual (Page 40)

2-22 Chapter 2: Hardware information
2.5.4 PCI slots
The PCI slot supports cards such as a LAN card, USB card, and other cards that
comply with PCI 2.3 specifications.
2.5.5 PCI Express x8 slots (x8/x4 link)
The onboard PCI Express x8 slots provide x8/x4 link to CPU. These slots support
VGA cards and various server class high performance add-on cards.
2.5.6 PCI Express x16 slot (x16/x8 link)
The onboard PCI Express x16 slot provides x16 link to CPU. It automatically
switches to x8 link when the slot 4 is occupied. This slot supports VGA cards and
various server class high performance add-on cards.
2.5.7 PIKE slot
The PIKE slot allows you to choose and change your preferred SAS solution easily.
Install an optional ASUS PIKE RAID card based on your needs.
PCIEx8 slots (x8/x4 link)
PCI slot
PCIEx16 slot (x16/x8 link)
PIKE slots