Recently I bought a rx 5700 and I noticed that if i limit my fps in any way(VSync or just by limiting the framerates) my fps keeps bouncing arround that specifc limitation, for example I'm playing pubg all the time at arround 90 fps, so when I try to cap it at 60 it bounces between 50-60 and as I said it doesn't matter if it's with vSync or just my limiting it.