Question Does my Vega 56 not getting enough power?

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I recently bought a Vega 56 card from Sapphire, and it runs fine until it has to go under load. Then strange pixels appear on screen, my system crashes to desktop and then proceed to keeping on crashing the display until i forcefully shutdown, which then the driver will be shagged and i have to reinstall everything related to the GPU.
From what ive read, 550w is enough for my system, but maybe i should get 2 8pin pci-e cables instead of a double one?

Rig:
Ryzen 3600
Msi Tomahawk Max
Sapphire radeon rx Vega 56 pulse
2x 8gb HyperX Fury ddr4 2666mghz
550W Corsair cx550M bronze

 

[Deleted member 2731765]

Then strange pixels appear on screen,

Can you post a screenshot of this issue ? Sounds like a GPU VRAM problem. How OLD is your PSU ? How many PCI-E power connectors does it actually require ?

 

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Can you post a screenshot of this issue ? Sounds like a GPU VRAM problem. How OLD is your PSU ? How many PCI-E power connectors does it actually require ?

Ofc its not a screenshot, since my pc crashes during this: https://postimg.cc/0Kg5TcQY

The PSU is brand new, straight out of the box. The GPU has 2x 8 Pci-e power connectors

 

[Deleted member 2731765]

Okay....From that image posted above, those look like "artifacts" to me. Most probably due to a faulty GPU VRAM. But have you overclocked the GPU ? You can undervolt the GPU and then check the card again.

Did you plug both the 8-PIN cables to the GPU ? Remove any overclocks/OC applied to the video card, if any. Also, try doing a CLEAN re-install of the GPU drivers. Use the DDU tool, and do it in safe mode.

https://www.guru3d.com/files-details/display-driver-uninstaller-download.html

What is the GPU Temp value while Gaming ?

 

[Scrwd]

Okay....From that image posted above, those look like "artifacts" to me. Most probably due to a faulty GPU VRAM. But have you overclocked the GPU ? You can undervolt the GPU and then check the card again.

Did you plug both the 8-PIN cables to the GPU ? Remove any overclocks?OC applied to the video card, if any. Also, try doing a CLEAN re-install of the GPU drivers. Use the DDU tool, and do it in safe mode.

https://www.guru3d.com/files-details/display-driver-uninstaller-download.html

What is the GPU Temp value while Gaming ?

No OC or undervolting as of yet. Problem happened for the first time, wiped the whole Pc clean with a new installation of windows, reinstalled basic drivers i got from MSI website. Problem still there.
Plugged both 8 pins pretty securely, checked more than twice.

AVG tempt is about 50-60, but the crash is very irregular (often after 20 min in Witcher, about 1 hour after AC4, sometimes 30min in Warthunder) so i cant say for sure.