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The BIOS setup program is used for many different things:

1. All of the slots, connections, voltages, and peripherals of your computer are managed by your BIOS. The motherboard requires the BIOS to boot, or even power on.

2. The setup window (usually accessible by hitting "delete" or "F1/F2" during boot) is used to manage all items mentioned in 1. On high end motherboards, you can change RAM (memory) clock speeds, CPU clock speeds, CPU and RAM voltages (very dangerous) and many other aspects of the hardware as well. This is how you "Overclock" your computer.

Most retail computers "HP" "Dell" etc... don't allow you to change anything in the BIOS to help them "idiot proof" their products.

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