Hello there
 
Just like many people here, I bought a GTX 750 Ti SC and was surprised by the fact that the fan doesn't run at a speed lower than 40%. To make the card quieter, I've tried flashing a custom BIOS using nvflash and Maxwell Bios Tweaker 1.36. The problem is I can't complete the BIOS replacement due to Maxwell BIOS Tweaker changing the original checksum after I click "Save BIOS".
 
Am I doing something wrong? I'm currently using the following command: nvflash -6 (biosname).rom, on an elevated command prompt and with the GPU disabled on Device Manager. If there's no easy way to fix this checksum thing, is there anything I can do to make the card quieter?
 
I'm currently using a Thermaltake V3 case that stands on the floor, next to my desk, but I'll soon upgrade to the Thermaltake Core V1 mini ITX case and I intend to keep it on my desk right beside my monitor and speakers, and as things are now I'm pretty sure the noise will be even more noticeable :(

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

Well, I didn't know that, I thought BIOSes retained the same checksum and that's why people could flash their GPUs. Since it's normal for the checksum to change, what am I doing wrong then? So far I've tried:
 
nvflash --protectoff
nvflash -6 (biosname).rom
 
and always got the same errors: 
 
Code 8: BCRT_ERROR_CODE_BODY_SIGNATURE_MISMATCH
and
Code 7: BCRT_ERROR_CODE_BODY_FNV_HASH_MISMATCH

What version of nvflash are you using?

Nvflash 5.287 x64 with certificates checks bypassed
Maxwell Bios Tweaker 1.3.6

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

You should also be using the kepler bios tweaker not the maxwell one.

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?

caiokn
Isn't GTX 750 Ti the 1st Maxwell GPU?

It's a maxwell gpu based on kepler architecture. 
 
"The GM107 (Maxwell) at the heart of the GTX 750 Ti is based on Nvidia’s Kepler architecture, but significantly different than its predecessor." 
- http://www.extremetech.com/gaming/176785-nvidias-new-maxwell-powered-gtx-750-ti-is-hyper-efficient-quiet-a-serious-threat-to-amd

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