Question Garbage Display then restart

Aug 25, 2020
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Specs:
rx 580 4gb
G4560 Intel
500 watts FSP 80+

my DVi to hdmi cable is lousy but how it can restart?

minimum watts of rx 580 is 450 watts
but i got 500 watts

i can play games but sometimes Garbage Display showing sometimes no cable connected and it's like GPU stop.

I even GPU stress it but it didn't shown Garbage Display
 

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