If the system contains a system SBIOS the supports compatibility boot, the user will need to disable secure boot when asked during boot process These systems will detect a non-UEFI-enabled firmware VBIOS and allow the user to disable secure boot and then proceed with a compatibility boot. Note: Some system SBIOS's incorporate a feature called compatibility boot. In order to get the PC to boot with a graphics card that does not contain UEFI firmware, the end-user must first disable the secure boot feature in the system's SBIOS before installing the graphics card. Secure boot is enabled by default on certified Windows 8 PCs. ![]() A UEFI system BIOS is required in order for the Windows 8 Secure Boot feature to work. UEFI is a new system BIOS feature that is provided on most new motherboards. When an after-market graphics card is installed into a motherboard with UEFI enabled in the system BIOS, or if the system is a certified Windows 8 PC with Secure Boot enabled, the system may not boot.
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