My PC bottlenecks with the A10 5800k and a gtx 960 (4gb)

Sep 26, 2015
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So I just installed a gtx 960 into my build. I read up on it and apparently I should be able to run most modern games at medium to high but I have been having trouble doing so. I installed CoD BO2 and can't run it on medium despite the fact that the game is 2+ years old now. To make matters worse I used to be able to change my desktop resolution to a bunch of different sizes (to get better speeds) but now I can only use 1280×720 or 1920×1080 both of which don't work well with my monitor which needs to run at 1154×720 to show a proper picture. Any help is greatly appreciated. My specs are listed here:
AMD A10-5800K
EVGA GTX 960 4GB
4GB of DDR3 1600 (I have another 8gb stick coming in the mail)