A friend of mine bought 4 cards Sapphire RX 5700, simple, not XT.

Those cards works with these settings, for weeks, no one problem appeared.

Also on the rig with 5700XT, I have attached one Sapphire 5700 non XT too, (identically as mine friend own), it works perfect for 3 days, set at -24% power limit, GPU clock and voltage left untouched, mem at 920MHz.

Any ideea why my friend cards died?

Is too much 920MHz for memory?!