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Faulty gpu?

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I just recently bought new gpu (rx 7800xt)
And i have had alot of problems with it after installing it.
In the beginning i had screen flicker and black screens. I then upgraded my psu to 900w because my old was 50w below recommended.
It started to work better (no flicker)

But now i have started having black screen with white line, when starting pc. Could this all be that my gpu is faulty.

Also:
-I installed drivers correctly multiple times using ddu
-computer works normally with old gpu
My specs are:
-pc starts normally if i run cables trough motherboard and not gpu
-900w power
-rx 7800xt gpu
-i5 8500 cpu
-2 ssd
- asus prime z370-p motherboard
 
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