@OP, just as a rule of thumb from experience over the last 25 years of building PCs, I am not sure from GPU you are coming from, and its likely your card is faulty, however, when I install a totally new GPU especially from a new manufacturer or series of card, I always do it after a fresh Windows install. Its the only way to be sure of a clean install and no driver issues, crashing or stuttering from conflicting drivers. Its just good practice, its a pain, but how often do we really need to do it?, worth it to avoid all the hassle and pain.