BIOS IO Menu PCI Subsystem Settings Options

The following table describes the BIOS IO Menu PCI subsystem settings options.

Setup Options	Options	Defaults	Description
PCI 64 Bit Resources Allocation	Disabled/Enabled	Enabled	Enable or disable 64-bit capable devices to be decoded in above 4G address space. This setting is available only if the system supports 64-bit decoding.
Maximum Payload	Auto/128 Bytes/256 Bytes/512 Bytes/1024 Bytes/2048 Bytes/4096 Bytes	Auto	Set the Maximum Payload of the PCI Express device or allow the System BIOS to select the value.
Maximum Read Request	Auto/128 Bytes/256 Bytes/512 Bytes/1024 Bytes/2048 Bytes/4096 Bytes	Auto	Set the Maximum Read Request of the PCI Express device or allow the System BIOS to select the value.
PCIe Hot-Plug Support	Disabled/Enabled	Enabled	If enabled, allows the OS to support PCIe Hot-Plug. If disabled, it does not allow the OS to support PCIe Hot-Plug.