Alienware x51 r1 upgrade

[Bustinfelipe]

hey guys, i got an alienware x51 r1 a couple years ago as a gift, after checking my system specs for the first time in years i realized that im long overdue for an upgrade especially to play arkham knight, i have ntel(R) Core(TM) i3-2120 CPU with the Geforce 545 gpu, whats the best card to get?

 

[Noah-kun]

Seems to be a good answer here: Best gpu for my R1 (R1 POWERBOARD)