It's completely normal for the checksum to change after saving a edited vbios.

What version of nvflash are you using?

Try this one... http://www.mediafire.com/...4fizbst12r/nvflash.rar

Thx, I'll check the file in that link. It's a bit late here where I live so I'll post updates after some couple hours. Also, why should I use the Kepler one? Isn't GTX 750 Ti the 1st Maxwell GPU?

http://international.download.nvidia.com/geforce-com/international/pdfs/GeForce-GTX-750-Ti-Whitepaper.pdf
 
Nvidia knows best. 

Hello again
 
Tried the nvflash from that link you posted and I managed to flash the 0% fan BIOS, but had issues with the drivers that didn't recognize the card / didn't work as it should. So I had to revert to the old BIOS.
 
Also tried the Kepler BIOS Tweaker but it didn't let me change the "fan control" settings. Does that mean there's no way to lower the fan speeds? D:

Sajin
Just use the maxwell tweaker. You may need to re-install the graphics drivers after flashing a modded vbios.

Man you're my hero lol
 
It took me quite a bit of time and lots of reboots to make it work properly, but now I'm able to enjoy pure quietness when the card isn't at full load.
 
Thanks a lot!!
 
If anyone in need of help ever comes across this topic, here are the steps I took to make the flash sucessful:
 
1 - Used GPU-Z to make a copy of the current BIOS, edited it on Maxwell Bios Tweaker (kept a backup copy)
2 - Unninstaled GPU drivers
3 - Rebooted on safe mode, ran Display Driver Uninstaller, removed everything related to the GPU and rebooted again
4 - Flashed the card using modded BIOS, rebooted
5 - Installed the GPU drivers, rebooted
6 - Checked if there was any issues with your video drivers on Device Manager, since there wasn't anything with marked with a ! or any kind of symbol you don't see under normal conditions, I assumed everything went OK.
7 - Ran 15 minutes of Furmark while monitoring temps and fan speeds to confirm if the changes I made on the BIOS were running fine.
 
Everything went fine on Furmark, so I guess everything's OK now. I just hope that when I update the video drivers I won't have to do all that stuff again 

I'm having problems setting the proper values in BIOS. Could you post a screenshot of yours fr reference, please? I have EVGA GTX750 TI. My settings are below.

caiokn
Hey there
 
Here's a screenshot of mine.
 
All I did was change the RPM11 and PER01 values to 0.

Sold the card. Problem solved.