Unless you need support for more than 2TB of harddrives, or plan to update your boot firmware often, you should be perfectly fine using BIOS. UEFI will get you the benefit of faster boot time, and has a much nicer looking UI, but when your new PC is up and running you'll be fine either way.Nowadays, UEFI gradually replaces the traditional BIOS on most modern PCs as it includes more security features than the legacy BIOS mode and also boots faster than Legacy systems. If your computer supports UEFI firmware, you should convert MBR disk to GPT disk to use UEFI boot instead of BIOS.When switching between Legacy BIOS Boot Mode and UEFI BIOS Boot Mode (either direction), BIOS settings that affect the Boot Options Priority list settings will be changed. If the boot mode is changed, the boot candidates from the previous boot mode disappear.

What is the point of UEFI : UEFI provides support for larger disks with GUID partition table (GPT), enables faster boot times through optimized initialization, supports secure booting, and offers a graphical user interface (GUI) for system configuration.

Does using UEFI improve performance

Enabling UEFI mode on your laptop improves system performance by allowing for faster boot times, efficient memory handling, secure boot processes, support for larger storage devices, and better compatibility with modern hardware.

Why is Legacy better than UEFI : Whilst UEFI might sound like the clear winner, there is a time when Legacy BIOS is needed. If you are using an old operating system or old hardware, then UEFI isn't compatible with your PC. Therefore, you'll need to use Legacy BIOS.

UEFI mode is compatible with the GUID Partition Table (GPT) partition style, while the legacy BIOS mode is compatible with the Master Boot Record (MBR) partition style. Most of the latest features and capabilities are only available in UEFI mode.

MBR is compatible with legacy and older operating systems that do not support GPT. On the other hand, if you have a newer computer with UEFI firmware, GPT is recommended for better compatibility and support for modern features.

Is legacy boot good

It won't cause any damage. Legacy mode (a.k.a. BIOS mode, CSM boot) matters only when the operating system boots. Once it boots, it doesn't matter anymore. If everything works as expected and you're happy with it, legacy mode is fine.If you use a very old operating system, you should use Legacy. As long as your operatings system supports UEFI, I would recommend you use UEFI because it it more advanced. Most of the recent hardware support UEFI and also compatibale with Legacy mode. If you choose legacy mode, Windows can only boot from MBR disk.Some UEFI modules and drivers can be loaded in parallel, rather than legacy sequential, to reduce boot time. Updated and larger Option ROMs can be used to initialize expansion devices such as graphics, audio, networking, and storage controllers.

UEFI natively supports NVMe storage devices, providing efficient access to high-performance, non-volatile memory-based storage. Example: UEFI allows seamless integration of NVMe drives as boot devices, enabling faster storage access and improved overall system performance.

Is UEFI good for gaming : Gamers who use solid-state drives (SSDs) benefit from UEFI's support for larger storage devices and its ability to boot from drives larger than 2 TB. This is particularly important for those who have extensive game collections and prefer to keep them on fast storage to reduce load times.

How much faster is UEFI : Anyway, a BIOS boot, or UEFI hybrid with CSM (which provides a BIOS boot mode) is a 9 second boot. Pure UEFI boot — same machine and same drive — is a 30 second boot.

Is GPT UEFI or Legacy

When installing Windows*, the partition style used will determine if UEFI mode or legacy BIOS mode is supported. UEFI mode is compatible with the GUID Partition Table (GPT) partition style, while the legacy BIOS mode is compatible with the Master Boot Record (MBR) partition style.

When you deploy Windows to a UEFI-based device, you must format the hard drive that includes the Windows partition by using a GUID partition table (GPT) file system. Additional drives may use either the GPT or the master boot record (MBR) file format.UEFI mode is compatible with the GUID Partition Table (GPT) partition style, while the legacy BIOS mode is compatible with the Master Boot Record (MBR) partition style.

Should I turn on legacy boot : Newer Windows 10 or Windows 11 PCs might require you to manually enable legacy boot mode in order to boot into older operating systems or bootable tools and utilities. However, when you've finished with those applications, it's often necessary to re-enable UEFI booting to resume using your PC normally.