Nice!! Not sure if mine are dual BIOS, but how do you do that?
It's really not very hard. If you have FTW models (I think I saw you talk about it in another thread) they have two bioses. They should have a little switch on the edge of the PCB to switch between them.
Typically you are allowed to flash the second bios and do whatever you want with it so long as the primary bios is left alone. eVGA doesn't seem to care what you do with either as long as you flash the primary bios back to stock before RMAing it.
There are some guides you can find online (I can't seem to locate a decent one right now but I know they exist). I'll outline what you need and the basic steps. I highly recommend flashing the second bios only in case of disaster. You can always switch it back to the primary bios even if the second one gets borked.
Needed:
GPU-Z
Maxwell Bios Tweaker
NVFlash with certificates checks bypassed.
You'll use GPU-Z to take a copy of the original bios. You might want to boot with both bioses and record them, sometimes the second bios has different settings.
Open the bios copy in Maxwell Bios Tweaker. The fan settings are pretty easy to mess with and you can tweak and test it until you get it to work the way you want. Make sure not to change anything else, even scrolling the mouse wheel changes settings. Once you're done, save the bios.
You'll open Device Manager, locate your card, and disable it.
Launch NVFlash. Turn the EEPROM protection off. Flash the card with the new bios. Re-enable EEPROM protection. Restart. Open Device Manager, re-enable it, and voila! New bios tuned to your specification.