gpu fps help

[cameron benjamin]

hi guys im get a windforce 770 2gb I was wondering how much fps it will get on games like rust dayz and bf4 on ultra or high if I get the 4gb one will it make a difference and how much

 

[ikaz]

What resolution do you plan on playing it at and what the rest of your system look like.

 

[cameron benjamin]

1920 1080
don't now much about the rest of the computer yet what would be the best build for games like that I am putting £700 on the table to get all of it with I got windows 7