Up to Windows 10, the firmware bitness matches the bitness of Windows, ie. ALL systems pre-installed with Windows 8/8.1, 10 and 11 boot in UEFI/GPT mode.Very few late systems pre-installed with Windows 7 are known to boot in x86_64 UEFI/GPT mode by default. MOST of the systems pre-installed with Windows 7 x86_64, irrespective of Service Pack level, bitness or edition (SKU), boot in BIOS/MBR mode by default.All systems pre-installed with Windows XP, Vista or 7 32-bit, irrespective of Service Pack level, bitness, edition (SKU) or presence of UEFI support in firmware, boot in BIOS/MBR mode by default.Windows 11 only supports x86_64 and a boot in UEFI mode from GPT disk.They do not support IA32 UEFI boot, x86_64 UEFI boot from MBR disk, or BIOS boot from GPT disk. Windows 8/8.1 and 10 x86_64 versions support booting in x86_64 UEFI mode from GPT disk only, OR in BIOS mode from MBR disk only.On market, the only systems known to ship with IA32 (U)EFI are some old Intel Macs (pre-2010 models?) and Intel Atom System-on-Chip (Clover trail and Bay Trail) Windows Tablets, which boot ONLY in IA32 UEFI mode and ONLY from GPT disk. They do not support x86_64 UEFI boot from GPT/MBR disk, x86_64 UEFI boot from MBR disk, or BIOS boot from GPT disk. Windows 8/8.1 and 10 x86 32-bit support booting in IA32 UEFI mode from GPT disk only, OR in BIOS mode from MBR disk only.A good example of this is Windows 11 which still works on a BIOS/MBR configuration once the Windows Setup check is bypassed. Note: The following points only list configurations supported by the Windows Setup even though Windows itself may still work on these unsupported configurations.

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