Question Is my pc dying or am I just tripping?

Jan 1, 2020
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I just built my pc and it’s gone well until now.
I built I 3 weeks ago and now it’s starting to get weird, when I make the graphics in my games lower, for example gta5 it makes the FPS drop hugely. I have a ryzen 2700x gtx1070 8gb 2400ghz ram and it got around 80 average FPS and max170 and Now when I play I get less and less FPS for each time 40,30,20 and 10 average. Now when I restored my settings I get 70 FPS average, why is this happening? Is it bad for me to make my graphics lower? I try to stream and that’s why I lowered it but it seems to make things worse pls help.
 
Jan 1, 2020
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Ok but i have a rog strix b450-f and i dont know if I can use memory that’s over 2666mhz, can I? So I have to overclock (I don’t know how to oc ram btw)?