netkas.org forum

General Category => Rom things => Topic started by: elsocko on August 10, 2015, 11:49:52 PM



Title: Flash for GTX 750 ti boot screen
Post by: elsocko on August 10, 2015, 11:49:52 PM
I'm not seeing any mentions of a flash for GTX 750 ti boot screen. Is there such a beast?


Title: Re: Flash for GTX 750 ti boot screen
Post by: Sebinouse on August 12, 2015, 04:17:49 PM
This time nvidia hasn't released any maxwell cards for Mac. So you wont find any public roms for maxwell.

MCV (http://www.macvidcards.com/store/p47/Nvidia_GTX_750_Ti_2_GB.html) flashes/sells 750ti with EFI ROM (BootScreen on non-4k monitors).
So it is possible ... and not so expensive ($80.00 / $225.00) but it's absolutely not funny  ;D.


What needs to be done is more or less the same as for GTX770 (http://forum.netkas.org/index.php/topic,8809.0.html) :

Primary challenge is changing device I'd in BIOS and EFI.

Modern Nvidia EFI has 5 functional sections.

1. InFoRom image
2. PC BIOS
3. EFI/UEFI
4. Some weird section
5. Security certificate

All 5 sections need to match for card to work in Mac and Windows.

Probably easier to start learning on Fermi as they only had 2 parts but many
EFI changes and BIOS changes are similar.

I will give a warning, with KEPLER and Maxwell if you make changes to rom that are t properly reflected in the InFoRom inage, it may let you flash the card into a non-functional state but then not let you flash it back, giving the message "failed to merge inforom image". If you do not have means to erase EEPROM you have created a "brick".

Better to start with Fermi.

GTX750ti PC Bios (Maxwell) : Link (http://www.techpowerup.com/vgabios/index.php?architecture=NVIDIA&manufacturer=&model=GTX+750+Ti&interface=&memType=&memSize=2048)
GTX680 Mac Bios (Fermi): Link (http://forum.netkas.org/index.php/topic,5709.msg19644.html#msg19644)
GTX680 PC Bios (Fermi): Link (https://www.techpowerup.com/vgabios/128201/EVGA.GTX680.2048.120330_1.rom)

I'm also interested in this feature, I will give a closer look later on ...