RX-480 asus strix crashes coloured screen

I crash my pc every now and then 30 minutes. displays a coloured screen (different all the time) and goes black and becomes unresponsive. card is brand new (8gb) model bought after another rma disaster with the same card. ddu and windows reinstall didnt solve the problem. problemn is with and without the overclock on the gpu. temps seem alright at around 70 degrees max.

 

specs:

R5 1600 stock cooler

B350m-a prime

RX-480 strix 8gb non fac oc

850 evo 256 ssd

wd blue

Rm650x psu

win 10 pro