I have h97 pro gamer motherboard with gtx 970 gpu and i5 4590, can i upgrade my processor to i7 4790k?

Mar 9, 2016
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just like the description, can i upgrade my processor?
my specs are :
processor i5 4590
motherboard asus h97 pro gamer
ram vengence 4x4gb
gpu asus strix gtx 970
psu corsair rm 850

can i oc it using h97 pro gamer mobo after i upgrade to i7 4790k?
 
because when im playing some game with high texture i got laggy sometimes, for example assassin creed unity, after i saw ther system requirements i notice that recomended cpu are i7-3,5 ghz. so i decided to upgrade my cpu. what do you think about i'm upgrading the cpu? or do i need to upgrade my gpu to 980 compared to upgrading my cpu?