what to upgrade, gpu....

my thoughts: good rig,it didnt do what i need .its just for gaming.now i cant record my game play with fraps cause its lag a lot and im getting cpu temperatures 65 cels. in 20 minutes gameplay bf4 in auto settings with high resolution its unplayable,after more time 45min. gameplay i get 75 celsius on gpu and its lag time to time.i have stock fan for my cpu i can overclock the case is i dont wanna do that cause im not gain a lot i choose to upgrade my ring. my rig spec. cpu I-7 3770k gpu Geforce Nvidia GTX 660 factory overclock 2gb gddr5 signature2 motherboard GYGABYTE z77-ds3h psu Fatality 750w memory Corsair ddr3 2x4gb 1600Mhz and g.skill ddr3 2x4gb 1600Mhz.
 
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