Try to use Msi Afterburner 4.6.2 beta 2 (go to settings/general and unlock voltaje control and voltage monitoring), after adjust to around to -43% power limit, leaving all others (Gpu, Mem, Voltage) stock, untouched.
Check for at least 24 hours of stability, if fails increase power limit from -43% to around -40%.
When found stability, increase mem clock with 5MHz steps at 10-20 hours interval until find max OC stable. Then increase again power limit from -40% to -39% and that's it. Settings are for Sapphire 5700XT.
Do no try for first time to increase memory to 900-915Mhz, it could fail, first find max OC stable, test 24 hours for stability and after go further.
Example here:
https://i.postimg.cc/YqdRr4R0/Stability.jpgCan I use this procedure also for RX 5700 Pulse? I tried to use MSI Afterburner (but I don't remember which version I used..) to decrease the voltage to 0,750V but the value was not set...
