Asus Maximus III Extreme - Manual (Page 78)

3. GO button
Press the GO button before POST to enable MemOK! or press it to quickly
load the preset profile (GO_Button file) for temporary overclocking when in
OS.
4. BIOS button
The motherboard comes with two BIOS. Press the BIOS button to switch
BIOS and load different BIOS settings. The nearby BIOS LEDs indicate the
BIOS you are using.
2-48 Chapter 2: Hardware information