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ASUS P4S533 motherboard user guide
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PCI 2.1 Support [Enabled]
This field allows you to enable or disable the PCI 2.1 features. Keep the
default setting [Enabled] if you installed PCI 2.1 compliant cards. Set to
[Disabled] if you installed any card that is not PCI 2.1 compliant.
Configuration options: [Disabled] [Enabled]
Onboard PCI IDE Enable [Both]
This field allows tou to enable either the primary IDE channel or secondary
IDE channel, or both. You can also set both channels to [Disabled].
Configuration options: [Both] [Primary] [Secondary] [Disabled].