Asus MAXIMUS VIII EXTREME User Manual page 48

3. DIMM LED (DIMM_A1_LED; DIMM_B1_LED)
The DIMM LED indicates when the corresponding memory channel is enabled.
Refer to DRAM channel jumper for more information.
4. BIOS LEDs (BIOS_LED1-2)
The BIOS LEDs help indicate the BIOS activity. Press the BIOS button to switch
between BIOS1 and BIOS2 and the LED lights up when the corresponding BIOS is in
use.
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Chapter 1: Product Introduction