Frequent mini-stuttering in games

[sokarel 0]

So, for like 1-2 months I'm struggling with mini stuttering in games. Here is the video how stutters look: https://imgur.com/mxqb8Jq. Usually stutters are smaller, but sadly frequent.

• My spec:
  - CPU: I5-7500
  - GPU: AORUS RX 580 8GB
  - RAM: 16GB Dual-Channel DDR4 1066MHz
  - MOBO: ASRock H110M DVS R3.0
  - PSU: Corsair CX450M 450W - does this PSU provide enough energy for whole computer? everything throughout these years was fine until last 2 month, I kinda suspect it
  - HARD DRIVE: SSD: MX500 500 GB 2.5" SATA III 
  - COMPUTER CASE: SilentiumPC Gladius M35 - I add this information just in case, if my PSU doesn't have enough power to run all things after SSD upgrade (2x FAN)

• Things I've tried:
  - Clean Windows 10 Home reinstall
  - BIOS update
  - XBOX Game mode and DVR turned off
  - Both power plans checked
  - OCCT CPU stress test passed without any error (1,5-2h)
  - checked both RAMs with memtest86 one after another, passed without any errors
  - Windows performance settings doesn't help
  - clean drivers reinstall with DDU (safe boot)
  - high-precision event timer turned off
  - CPU and GPU temps are totally fine according to HWINFO
  - graphic, performance settings in games don't have rebound on stuttering

I bought this PC over 4 years ago, but I still want to use this computer smoothly for about 6-8 months, because I'm planning to buy new one next year. I can afford to replace a component now, but not whole computer. I don't play high demanding games. Games I play: League of Legends (mostly), Path of exile, Valorant, sometimes Witcher 3. Competetive games are not runnings smoothly. I really want to finally find a reason behind this problem. I sadly don't remember exact moment when it all started. Please, help me find what's causing it.

[BaronSmoki 3]

Based on this thread here, you're using a pirate copy of Windows: https://forums.tomshardware.com/threads/frequent-mini-stuttering-in-games.3784369/

PCGW doesn't assist with pirated software.