Say what you use the PC for, For gaming a gtx 1050ti for $150 will be much better than the 460, but you'd also need to upgrade CPU which means new MB and DDR4 instead of DDR3.
Is your current PC one you built? If so on low budget looking for gaming upgrades I'd look for a $150 video card and try overclocking Athlon.
If its a purchased PC likely you can't overlock. Go look on youtube for videos of the games you play with the same Athlon *not overclocked* and various video cards and see if the gaming experience gets better if you stay with the althlon at stock speeds and get better video.
High budget ($600+) gaming builds just asked for builds at your budget, not much will carry forward.
For creating home movies, or internet browsing totally different answers.