The M4A89GTD Pro/USB3, as nearly all Asus motherboards, uses the American Megatrends BIOS. This is a tabbed BIOS for easy navigation. The BIOS opens to the Main menu, which contains date/time, drives found during POST, and the System Information submenu.
The System Information submenu gives BIOS information and basic CPU info.
The AI Tweaker menu contains all relevant overclocking settings. The only submenus are for memory tweaks, where they should be.
Precision voltage tweaking is made very easy by Asus’ Precision Tweaker 3. Rather than increments of .125 or other rather large voltage tweaks, Precision Tweaker 3 gives you tiny increments for real precision. For example, the VCore increments are .003125v.
The Advanced menu contains submenus for settings of the various motherboard subsystems.
The CPU Configuration submenu has settings not included in the AI Tweaker menu such as Cool n’ Quiet and C1E. Also found here is Core Unlocker, which I will talk about shortly.
The Onboard Devices menu has settings to enable/disable the various controllers on the motherboard.
The Power menu contains various power related settings and the HW monitor.
The HW Monitor contains relevant temperatures, voltages, and fan speeds, and also contains the controls for the onboard fan buses.
The Boot Settings Configuration submenu is contained within the Boot menu. Here you can disable the POST splash screen.