Before thinking about using this bios, be sure that you've got the evga gtx 780 sc acx graphics card and i will not be held responsible for any misstakes made by you or anything else for that reason.
If you want to lower the fan speed from 39% to 29% i found an . It worked for me and the "humming" sound disappears at 29-35% fan speed. this worked great for me and made my pc significantly quieter.
You can use the fan control and oveclocking application in combination with this bios as applications like Precision X and afterburner won't allow lower fan speeds...most likely :P
Remember to use something like to save the current to a ROM before updating if something were to happen and you've got to reinstall the nvidia drivers. The driver update is very fast and didn't give me any sign of "completion". Basically the first sign of a successful update was due to the lower fan speed option :)
*Edit
Appearently i can't either hyperlink or post URLs (some restrictions) huh.
go to youtube and type this "EVGA GTX 780 Superclocked ACX BIOS Update" into the search box and you'll find the video by that name.
Google for "Downloading NVIDIA Inspector Download version 1.9.7.2" and you'll get to GURU website, DL link quite far down the page.
Google for GPU-Z and click the "techpowerup" link. guide yourself from there on to a download.
sorry for being unable to link directly :/
Good luck guys