User Manual
Page 52
... [Enabled] allows legacy operating systems to zero (0). Configuration options: [Disabled] [Enabled] Max CPUID Value Limit [Disabled] Setting this item to [Disabled] forces the XD feature flag to always return to boot even without support for the CPU and other system devices. BIOS SETUP UTILITY Main Ai Tweaker Advanced Power Boot Tools...
... [Enabled] allows legacy operating systems to zero (0). Configuration options: [Disabled] [Enabled] Max CPUID Value Limit [Disabled] Setting this item to [Disabled] forces the XD feature flag to always return to boot even without support for the CPU and other system devices. BIOS SETUP UTILITY Main Ai Tweaker Advanced Power Boot Tools...