Specific models of EVGA graphics card contain a Dual BIOS feature that allows the user to switch between two different BIOS versions. This allows you to flash the secondary BIOS for hotfix purposes and or for the purpose of overclocking. Only a certain amount of graphics cards have a dual BIOS option.
What setting switch to a particular BIOS does.
Master - If your BIOS switch is set to the Master position, that is the default BIOS that the graphics card is shipped out with.
-What it does-
-Fan Curve is less aggressive, the fans will not spin until the graphics card reaches about 60 degrees Celsius.
-The graphics card will have a lower power target
Slave - If your BIOS switch is set to the Slave Position, that is a secondary BIOS that allows the graphics card to have a slightly higher power target and target temperature. Which in turns allows more overclocking headroom. Note that with the Pascal archetecture that the clock speeds will drop once the GPU core reaches 60 degrees Celsius.
-What it does-
-Fan curve is much more aggressive, the fans will always spin, even in a idle state.
-The graphics card will have a higher power and temperature cieling which allows for more headroom in terms of overclocking. *Note that with the Pascal archetecture that the clock speeds will drop once the GPU core reaches 60 degrees Celsius.*
Switching the BIOS is easy:
1. Turn off the system.
2. Locate the BIOS selector as indicated below.
3. Switch the BIOS selector to desired BIOS position.
4. Boot up the PC.
5. You are now using the desired BIOS.
*After the system successfully posts up, the active running BIOS will be based on the BIOS selector position before system resets or powers up.
*Please do not change the BIOS selector position while the system is posting.
See the images below for reference.