MSI MS-6567 User Manual page 45

BIOS Setup
able to run in APIC mode. Enabling APIC mode will expand available IRQs
resources for the system. Settings: Enable, Disable.
MPS Revision
This field allows you to select which MPS (Multi-Processor Specification)
version to be used for the operating system. You need to select the MPS
version supported by your operating system. To find out which version to
use, consult the vendor of your operating system. Options: 1.4, 1.1.
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