Is there a way to know the exact chipset of the videocard and download corresponding BIOS?
goto techpowerup, they have a database of vga bioses
https://www.techpowerup.com/vgabios/you may need to remove the heatsink/fan to get the actual numbers off the gpu and memory chips.
also try gpuz at the same site but that utility sometimes depends on an accurate bios but it can also provide a lot of info even with a wrong/faked bios.
https://www.techpowerup.com/gpuz/