The Asus P4S8X uses the Award BIOS utility. Below you will find screenshots taken of the BIOS and a few explanations.
This is the first screen you will see once you hit DEL to enter your BIOS. It basically covers everything related to your IDE ports as well as your system time and date. You can also set passwords for accessing your BIOS and your computer.
The tab to the right of the main tab is the advanced properties. This is what all you overclocking kings have been waiting for. In this tab you control all your overclocking needs; things such as your CPU multiplier (which is of no use since the CPU is locked), FSB, memory speeds and all your voltages. The CPU VCore goes up all the way to 1.8v, AGP up to 1.7v, DDR up to 2.7v and memory support up to DDR 400 at default. Below all this you have another three sub-tabs that lead into more configurations.
One of the sub tabs of the advanced settings is the Chip configuration. This is where all your RAM tweaking goes. You can see you can set your RAM up manually or using templates like "Slow", "Fast" and "Turbo". Below that you have some important options to do with your video card. Such as AGP 4x/8x settings, enable/disable Fast Writes and your graphics aperture size. By the rule of thumb, your aperture size should always be half of your memory size.
The next tab over contains your power settings. This relates to all your ACPI and start up power management settings. You can set it to user defined (manual) or leave it on auto settings. Below that you have two sub-tabs, Power up control and Hardware monitor.
The Hardware Monitor setting is one of the sub-tabs in the Power tab. Here you can see all your temperatures, fan speeds and voltage readings.
The boot tab is for everything boot related. On the top of the tab you can control which device will boot first. For instance, if you are trying to load off a CD, you disable everything before your CD-ROM drive. Below that you have your simple settings like boot up floppy seek (if you don't have a floppy drive installed this is disabled), full screen logo enable/disable (a Asus P4S8X graphic that appears when you are booting) etc.
The last tab in your P4S8X BIOS is the exit tab. Here you can choose from 5 options. Exit the BIOS and save all the changes you made, exit the BIOS and lose all the changes you made, load setup defaults (the original settings), discard changes but continue working in the BIOS and save changes but continue working in the BIOS.