Conversely, the BIOS represents the foundational layer of the hardware. It is the low-level firmware that initializes the hardware during the boot process before the operating system loads. Tuning via the BIOS is the traditional, "hardcore" method. The primary advantage of the BIOS is stability and persistence. When settings are applied in the BIOS, they are saved to the motherboard's memory and applied every time the computer boots, regardless of the operating system or software conflicts. This is crucial for tasks that require absolute stability, such as sustained all-core rendering or competitive gaming. Furthermore, the BIOS offers granular control over system parameters—such as Load-Line Calibration (LLC) and advanced memory sub-timings—that software overlays often simplify or hide. However, the BIOS is unforgiving; an incorrect voltage or frequency setting can prevent the system from posting, forcing the user to clear the CMOS (Complementary Metal-Oxide-Semiconductor) physically, a process that can be daunting for beginners.