What is UEFI and BIOS? | Explained | eTech Prowess

BIOS perform quite a strict role and it might appear to you that they always do the same thing. In the past, BIOS was written on plain ROMs (or difficult-to-erase ROMs), without the possibility to write or to erase the ROM, the software couldn’t be programmed or upgraded. Nowadays, BIOS can be updated to support newer hardware/features and can be programmed to perform specific tasks such as:
Turning on/off USB ports, Serial ports or IDE/SATA ports;
Over/Underclocking CPUs/RAMs frequencies
Regulate motherboard fan controllers.

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