AMD has announced that its upcoming RX 9070 series (RDNA 4) GPUs will require a UEFI system for optimal compatibility. Put simply, it has dropped support for the older BIOS and CSM standards, requiring users to make the necessary shift to UEFI. While this doesn't mean RDNA 4 GPUs will cease to function with legacy firmware, AMD offers no assurance.
Colloquial use has employed BIOS as a blanket term for all sorts of motherboard firmwares, including UEFI. BIOS stands for Basic Input/Output System and contains essential instructions that allow your PC to initialize hardware, perform the Power-On-Self-Test and load the Operating System from storage. As the years followed, BIOS was superseded by UEFI which offers a GUI, Secure Boot and can support drives larger than 2.2TB. Notably, UEFI retains the core functionality of BIOS, just sprinkled with a pinch of modern features.
