Question Cpu usage drops in-game.

Aug 10, 2020
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SOLVED:
GPU causes the problem when it reaches anything higher than 80C°.


Motherboard: MSI Z87-G45

CPU: I7 4770

GPU: RX 580 8GB

RAM: 4x4GB DDR3-2400Mhz

Storage:
340GB SSD (windows installed on this drive)

1TB SSD (games installed on this drive)

1TB HDD (empty drive)


Monitor: 1920x1080 @ 144hz

In-game (Happens in all games), the first 5 minutes of gameplay are very smooth with no frame drops. Afterwards, I get stutters that last half a second. These stutters come and go every 5 seconds.

It makes gameplay unplayable, especially when playing a competitive game. I haven't tried to overclock or under volt anything in my system. Is there anyway to fix this? My GPU and CPU aren't overheating. I have already tried to reinstall windows, but nothing changed. I have tried looking for malware but found none.
https://www.userbenchmark.com/UserRun/31562187
Here's my PC's benchmark results.

BIOS are up to date. Changed ram frequency to 1600mhz. Tried installing old drivers, and tried reinstalling latest drivers. Tried clearing CMOS/ resetting BIOS.
 
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