upgraded GPU and i am getting the same FPS

went from 2060 super to 2080 super and I am getting the exact same FPS, lowest is 115 and highest is 250, even lowering the graphics settings down does not yield any additional frames. i play on a ultra wide monitor 1440p monitor I have lowered the resolution down to 1920x1080 and I am still getting the same FPS. also i get huge dips in frame rates at random in team fights, it goes down to 50fps and whole screen freezes for half a second. my CPU is a i4 4790k and my game is installed on a SSD. I know my GPU is working as intended because i have seen my frames increase on other titles.
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