Adobe Premiere Pro CC on PC lagging on playback

Hi Guys, I just built a PC for work and when i use Aobe Premiere and drop a video on the timeline. Tha playback is lagging/jumping back a few milliseconds. It's doing it on 4K videos and 1080p but it's still doing the same. 

I tried doing the proxies but it's still the same. 
When i rendered the video, it works fine, it's just really the playback that is lagging

Computer specs:

Motherboard:
ASUS ROG STRIX X570-E GAMING AMD X570 ATX

I don't know if it's the hardware or the software settings?
Can someone help?

Thanks