Hello, i bought a 580 8GB a couple months ago and it became faulty all i did was change the clock from 1430 to 1450 and now even at default speeds the card will cause flickering, randomly turn the screen to no hdmi connection and cause games to crash, i did not buy the card from sapphire directly but bought it in sealed packaging. when i use my 560 4GB no glitches occour, what should i do?
