TYAN TS75-B7122 Service Engineer's Manual page 143

5.3.11.5.2 Socket 1 Configuration
IOU0 (IIO PCIe Port 1)
Selects PCIe port Bifurcation for selected slot(s).
x4x4x4x4 / x4x4x8 / x8x4x4 / x8x8 / x16
IOU1 (IIO PCIe Port 2)
Selects PCIe port Bifurcation for selected slot(s).
x4x4x4x4 / x4x4x8 / x8x4x4 / x8x8 / x16
IOU2 (IIO PCIe Port 3)
Selects PCIe port Bifurcation for selected slot(s).
Auto / x4x4x4x4 / x4x4x8 / x8x4x4 / x8x8 / x16
IOU3 (IIO PCIe Port 4)
Selects PCIe port Bifurcation for selected slot(s).
x4x4x4x4 / x4x4x8 / x8x4x4 / x8x8 / x16
IOU4 (IIO PCIe Port 5)
Selects PCIe port Bifurcation for selected slot(s).
x4x4x4x4 / x4x4x8 / x8x4x4 / x8x8 / x16
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