Asus TUF Z270 MARK 2 Bios Manual page 44

DMI/OPI Configuration
This item allows you to control various DMI (Direct Media Interface) functions.
DMI Max Link Speed
PEG Port Configuration
PCIEX16_1 Link Speed
PCIEX16_2 Link Speed
PCIe Spread Spectrum Clocking
This item allows you to enable or disable Spread Spectrum Clocking for compliance
testing.
1.6.4 PCH Configuration
PCI Express Configuration
PCIe Speed
[Auto]
[Gen1]
[Gen2]
[Gen3]
IOAPIC 24-119 Entries
This item allows you to enable or disable IOAPIC 24-119 Entries.
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The system will automatically select the PCI-E port speed.
The PCI-E port will run at PCI-E 1.0 speed.
The PCI-E port will run at PCI-E 2.0 speed.
The PCI-E port will run at PCI-E 3.0 speed.
ASUS TUF Z270 MARK 2 BIOS Manual