It's your cpu and gpu
The 260x won't playit well you need something like a 270x or a 760 or up
As for your cpu it's recommended you use a quad core ivy bridge 3.5ghz and above
I believe it's yohr gpu holding you back but it's most Likely a combination of them both.
Try driving the textures to low and graphics settings to low and work your way up
If everything low doesn't fix it try updating your drivers and lowering the resolution and turning vsync into 1 frame
im using hw info so it tells gpu is using only 50 to 60% ...may be its cpu. i have changed the graphic settings and this doesnt make any different.. thx
Also overclock your ram and gpu (cpu if possible) as that will help with