Can't run Fallout 4 on ultra??

[beers]

Definitely plenty of 6950 2gb's out there, and if you can find the modified bios (not all of them had a switch) then you can turn your card into a 6970, with little work.

Most of the time you can simply just flash the 6970 BIOS as well without modification.

 

[spirit]

Regardless, a 6970 still won't be enough to play Fallout 4 at ultra. Why? Most of them only had 2GB of RAM, and if you flashed a 6950 then you may only have 1GB.