Fps up and down

Nov 25, 2018
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Hi i just upgraded everything in my pc except the power supply and case fans. I have a b450m prime motherboard and a ryzen 3 1300x cpu and 8gb of ddr4 ram i get lag and i get fps drops from 60 fps to 0 fps what could that be. Im lose i know this new system is better than my old fx 8320 and ddr3 system but i was getting better fps and no lag at all