Getting lag spikes / micro stutters / stutters

Phazoner

Distinguished
It's not weird for the CPU being more used than the GPU as a i5 8400 will obviously bottleneck a RTX 2080.

In my experience it is even hard to get a completely fluid experience in PC games, specially when playing online. Which games are giving you problems? For example, Forza Horizon 3 usually stutters but sometimes it seems to work fine. Battlefield 1 can sometimes show some lag that feels like stutters and anyways it isn't rare to have frame dips.