Do a cleanup for ur card.
remove the heatsink reapply thermal paste..
Check for component missing or not. capacitor or resister..
clean the X16 pins and the pins from the motherboard.

Buy the PCB cleaner from Mr.DIY.. spray kao kao let the cleaner drain 1 side to another side and down to the drain... spot cleaning does not help ya.. soak it.. tekan spray for 10seconds or longer..

Try new power cable... the 6pin power. if u using molex.. try different cables/ connector

good luck...

Edited: Typo & add on

This post has been edited by popopi: Feb 23 2021, 01:16 PM