I7 3770k - still worth?

Hello

Does is still worth buying i7 3770k? Currently I have i5 2500k @ 4.2 GHz with gtx 1070 on ASRock z68 extreme 3 gen 3 and I feel like as if processor was blocking GPU.

Is it better to change MOBO with CPU, or just put new CPU without big loss in performance.

I am playing FHD
 
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