Peripheral Component Interconnect - Wikipedia
XVR-100 Frame Buffer card: 375-3181 pci slot 2 Ultra3 SCSI HBA: 375-3057 pci slot 4 motherboard 540-633 obp 4.16.1.
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8 GPU Mining Motherboard – B85 Detailed Description of B85 Motherboard: B85 motherboards are made up specially for mining with 8 pci express slots.
PCI Express
Therefore, the mainstream PCI-E slots on the motherboard are basically concentrated on the four types: PCI-E x1 / x4 / x8 / x16.