Crazy lag and FPS drops in all games Windows 10

May 22, 2018
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So i recently built my own pc and weirdly enough over the last weekend, all my games have completely shite fps like CSGO runs at about 80fps -.- and Pubg around 30 fps

My specs are as follows:
CPU : Amd Ryzen 5 1600
GPU : Saffire Pulse RX 580
Memory : 16GB DDR4 2400mhz
MOBO : Asus B 350F Gaming MOBO
SSD : kingston sa400s37/120g
Monitor : Acer KG241Q.

FYI... My BIOS is fully updated as well as all my drivers. I even tried resetting my windows. Nothing worked.