huilun02 :
That very chart already shows a bottleneck occurring with the i3-2100... It's only at 61 average
wow! you are the graphic card expert and you don't know how to read a chart! congrats! the red lines are maximums and mean nothing. the grey lines are average. a 6th grader could have told you that.
the averages are 39 vs 44. and OP has a 2120 which is significantly faster and would probably yield an extra FPS or two.
now let me teach you how the rest works. the CPU processes the code written in the game then feeds instructions down to the GPU. the GPU can NOT read instructions from a program running without the help of the CPU.
what is happening in this situation is that neither the i3 nor the phenom X4 can feed instructions fast enough to the Ares II. the OP will NOT have this problem because his GPU barely handle the workload passed down from either of the CPUs in question. the ares II is essentially a pair of 270x on one card.
and for future reference, the GPU cannot do the job of the CPU in this particular situation. so i don't know where you are coming from with this "compensate" BS. in order for that to happen the game would have to have been written in openCL or something along those lines. which is not the case.
and lastly, the OP has just one 270x, so he will not be using settings this high. with the settings he will be using, the i3 2120 will yield north of 50 FPS which is more than enough to play this game. if he spends 300+ on upgrading the CPU and mobo just to squeeze an extra 2 or 3 FPS, do you think he will see a difference? NO! so stop misleading people to make them spend money they don't need to spend.