Question hi , i'm getting black screen when gaming for few minutes

Jul 25, 2020
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first of all my specs are :
Intel i5 4590
Msi Rx 480 8 GB gaming x when gaming i'm getting 60 C and my fan are working 100%
2x 4 GB ram
Hewlett-Packard motherboard 18E7
HDD 500 GB from DELL


i was suffering from this issue a long time ago and i tried multiple solutions like undervolting GPU which worked fine for a couple of days and backs to the same issue and at the first beginning i tried to overclock my monitor to 75 Hz but i was getting black screen so i used the default settings (60 Hz) and was not suffering at all of the problem but now i tried again to overclock to 75 Hz and it worked fine also for a couple of days and it back to give me this issue so i tried to only play on low settings and limited fps to 60 fps and i have no problem for a 2 weeks so my problem is when my frames are above of 60 fps i'm getting black screen any solution guys i'll be thankful for your help .