Look like Ubisoft dont know at all what the GPUs perfs are with their own game....
http://www.clubic.com/jeu-video/article-740121-3-far-cry-4-guide-technique.html
Minimum required :
http://www.clubic.com/jeu-video/article-740121-3-far-cry-4-guide-technique.html
Minimum required :
Recomended :NVIDIA GeForce GTX 460
AMD Radeon HD5850
Lol....NVIDIA GeForce GTX 680
AMD Radeon R9 290X