My gpu black screens when I start a game up

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Before i had the gpu installed i got 30fps with the intel 630 graphics. After i installed the gpu i downloaded the drivers and when i started a game i still got 30fps for a few seconds them my gpu would black screen, its like the gpu hasnt help at all .

Ive tried=
•ddu

•updating bios

•updating windows
•updating driver
•researched if everything is compatable(it is)

i have

•core i5-9600k

•rx570 4gb

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