■The way for installing four expansion card:
PCI_E2
PCI_E3
PCI_E4
PCI_E5
PCI_E6
PCI_E7
■The way for installing five expansion card:
PCI_E2
PCI_E3
PCI_E4
PCI_E5
PCI_E6
PCI_E7
■The way for installing six expansion card:
PCI_E2
PCI_E3
PCI_E4
PCI_E5
PCI_E6
PCI_E7