I just upgraded my pc from a gtx 970 to an RTX 2060 and it's running basically the same in every game I play. Fortnite on everything low runs 120-140 fps in a 5 person creative and modern warfare is barely playable. I get a lot FPS for no reason I'm starting to think i got a virus or something lol. My CPU is a i7-6700k not the best but it shouldn't be doing this bad. Also ive had this computer for like 5+ years that may also be a reason my parts are worn out maybe?