I replace my thermal paste regularly every 2month, I live in the tropical area plus almost half of my rig was R9 series. I'm using DeepCool z9 it cost me around $8, I'll need ten pcs each time replacing the thermal paste. The results are pretty good for me.
I have AMD Vega 56, but i couldn't unscrew the screws

All the crews now mess up since i forced to open with screw driver. Any solution for my case?