AMD FX 4100 is enough to have 30-40 fps in any game.Such questions like will handle or not are not correct.
Even Titan X will works with your CPU but not for full capacity.You can upgrade your CPU later.
You will have noticeable performance boost from your new video card anyway. But you need to do something with your CPU cooling system.
49 Celsius when Idle-it is not good.
Thank you but i decided that ill upgrade to FX 8300
and graphics to something another.
49 celsius is on graphics too. Why because i have case that filters heat bad
But maybe ill try to replace the thermal paste
I am very sorry that i am answering very late
Ty again and good luck