6900 XT - Random black screen followed by a reboot when playing some games

I had this PC (and this issue) for 8 months now, sometimes, when I'm playing a certain game for some time, monitor goes off, then PC restarts, but monitor never goes back on, the white VGA light on motherboard stays on indicating that there is a problem with the GPU, the only way to get the PC running again is by pressing the power button to shut down and the turn it back on again and everything will be back to normal.

Edit: I forgot to mention after those crashes, motherboard turns om CSM automatically, I tried using the PC while CSM is enabled, but I still got those crashes.

Now these crashes are somewhat rare in normal situations ,for example, when I'm playing Dead by Daylight, it might happen maybe once a week, it can also happen in 2 hours, however, they are guaranteed to happen in an hour or less when I'm playing Dying Light 2 but only when "Raytracing" is on.

Now a lot of u are probably going to say that it's probably my PSU, however, I don't think it is, because for example, when I'm playing Forza 5, my power consumption is about 250w and I never get any crashes (almost 300 hours of playtime, no problem whatsoever), but when I'm playing Dead by Daylight, power draw is less than 100w but I get these crashes randomly.

Specs:

XFX MERC319 6900 XT Black Edition

R7 5800X

Corsair Vengeance Pro 32GB 3200mhz

ASUS ROG Strix B550-E WIFI

Corsair HX850

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Things I've tried:

  1. DDU driver, installing newer or older.
  2. Reinstalling Windows
  3. Install/Uninstalling chipset drivers and Ryzen Master
  4. Checking temperatures (they are more than fine)
  5. Disabling D.O.C.P and Smart Access Memory
  6. Updating MB BIOS
  7. Undervolting GPU both auto and manual (both slightly and considerably)
  8. Underclocking cores from 2500 to 2200mhz.
  9. Increasing/decreasing GPU power limit
  10. Disabling PBO
  11. Running 3D benchmark softwares for hours to make sure temps are fine (AGAIN)
  12. Switching ram sticks orders
  13. Moving the problematic games from SSD to HDD and vice versa...
  14. Switching PCI-E cables

PLEASE HELP!!! I'm sick of this after 8 months